diff --git a/lib/galaxy/datatypes/metadata.py b/lib/galaxy/datatypes/metadata.py
index 54cb8951221..ae9f9655a92 100644
--- a/lib/galaxy/datatypes/metadata.py
+++ b/lib/galaxy/datatypes/metadata.py
@@ -66,6 +66,7 @@ class MetadataParameter( object ):
                 value = str( value )
         self.value = value
         self.context = context
+        self.display = True
 
     def __str__(self):
         if self.value is None:
@@ -264,4 +265,24 @@ class ColumnTypesParameter( MetadataParameter ):
     def __str__(self):
         return ",".join( map( str, self.value ) )
 
+class PythonObjectParameter( MetadataParameter ):
+    def __init__( self, spec, value, context ):
+        MetadataParameter.__init__( self, spec, value, context )
+        self.value = value
+        self.display = False
+    
+    def __str__(self):
+        if not self.value:
+            return self.spec.to_string( self.spec.no_value )
+        return self.spec.to_string( self.value )
+    
+    def get_html_field( self, value=None, other_values={} ):
+        return form_builder.TextField( self.spec.name, value=str( self ) )
+
+    def get_html( self ):
+        return str( self )
+
+    @classmethod
+    def marshal( cls, value ):
+        return value
 
diff --git a/lib/galaxy/datatypes/sequence.py b/lib/galaxy/datatypes/sequence.py
index 709dbdf442e..1a5695c9d3b 100644
--- a/lib/galaxy/datatypes/sequence.py
+++ b/lib/galaxy/datatypes/sequence.py
@@ -24,6 +24,7 @@ class Alignment( Sequence ):
 
     """Add metadata elements"""
     MetadataElement( name="species", desc="Species", default=[], param=metadata.SelectParameter, multiple=True, readonly=True, no_value=None )
+    MetadataElement( name="species_chromosomes", desc="Species Chromosomes", value={}, param=metadata.PythonObjectParameter, readonly=True, no_value={}, to_string=str )
 
 class Fasta( Sequence ):
     """Class representing a FASTA sequence"""
@@ -165,9 +166,10 @@ class Maf( Alignment ):
     
     def set_meta( self, dataset, first_line_is_header=False, **kwd ):
         """
-        Parses and returns species from MAF files.
+        Parses and sets species and chromosomes from MAF files.
         """
         species = []
+        species_chromosomes = {}
         try:
             for i, m in enumerate( bx.align.maf.Reader( open(dataset.file_name) ) ):
                 for c in m.components:
@@ -176,15 +178,20 @@ class Maf( Alignment ):
                     # "src_split" finds the rightmost dot, which is probably
                     # wrong in general, and certainly here. 
                     spec = c.src
+                    chrom = None
                     if "." in spec:
-                        spec = spec.split( "." )[0]
+                        spec, chrom = spec.split( ".", 1 )
                     if spec not in species: 
                         species.append(spec)
+                        species_chromosomes[spec] = []
+                    if chrom and chrom not in species_chromosomes[spec]:
+                        species_chromosomes[spec].append( chrom )
                 # only check first 100,000 blocks for species
                 if i > 100000: break
         except: 
             pass
         dataset.metadata.species = species
+        dataset.metadata.species_chromosomes = species_chromosomes
     
     def missing_meta( self, dataset ):
         """Checks to see if species is set"""
diff --git a/templates/dataset/edit_attributes.mako b/templates/dataset/edit_attributes.mako
index faf11771489..75c63bbcbb5 100644
--- a/templates/dataset/edit_attributes.mako
+++ b/templates/dataset/edit_attributes.mako
@@ -39,15 +39,17 @@
             <div style="clear: both"></div>
           </div> 
           %for element in metadata:
-              <div class="form-row">
-                <label>
-                    ${element.spec.desc}:
-                </label>
-                <div style="float: left; width: 250px; margin-right: 10px;">
-                    ${element.get_html()}
+              %if element.display:
+                <div class="form-row">
+                  <label>
+                      ${element.spec.desc}:
+                  </label>
+                  <div style="float: left; width: 250px; margin-right: 10px;">
+                      ${element.get_html()}
+                  </div>
+                  <div style="clear: both"></div>
                 </div>
-                <div style="clear: both"></div>
-              </div>
+              %endif
           %endfor
           <div class="form-row">
               <input type="submit" name="save" value="Save">
diff --git a/tools/visualization/GMAJ.xml b/tools/visualization/GMAJ.xml
index bb9e66e7be4..4b742619417 100644
--- a/tools/visualization/GMAJ.xml
+++ b/tools/visualization/GMAJ.xml
@@ -10,7 +10,6 @@
             <filter type="data_meta" ref="maf_input" key="species" />
           </options>
         </param>
-        <param name="chromosome" label="Chromosome" value="" type="text"/>
         <param name="exons_file" type="data" format="bed,gff" label="Exons File" optional="True"/>
         <param name="highlights_file" type="data" format="bed,gff" label="Highlights File" optional="True"/>
         <param name="underlays_file" type="data" format="bed,gff" label="Underlays File" optional="True"/>
@@ -81,48 +80,53 @@ tabext = .bed .gff .gtf
 nowarn = $nowarn
 #end if
 
-#for $seq_count, $annotation in $enumerate( $annotations ):
-seq ${seq_count}:
-#if $annotation['chromosome'].value:
-seqname = $annotation['species'].$annotation['chromosome']
-#else:
-seqname = $annotation['species']
+#set $seq_count = 0
+#for $spec_count, $annotation in $enumerate( $annotations ):
+#if $annotation['species'].value in $maf_input.metadata.species_chromosomes and $maf_input.metadata.species_chromosomes[$annotation['species'].value]:
+#set $seq_names = [ "%s.%s" % ( $annotation['species'].value, $chrom ) for $chrom in $maf_input.metadata.species_chromosomes[$annotation['species'].value]]
+#else
+#set $seq_names = [$annotation['species'].value]
 #end if
+#for $seq_name in $seq_names:
+seq ${seq_count}:
+seqname = $seq_name
 #if $annotation['exons_file'].dataset:
-exons = ${seq_count}.exons.${annotation['exons_file'].extension}
+exons = ${spec_count}.exons.${annotation['exons_file'].extension}
 #end if
 #if $annotation['repeats_file'].dataset:
-repeats = ${seq_count}.repeats.${annotation['repeats_file'].extension}
+repeats = ${spec_count}.repeats.${annotation['repeats_file'].extension}
 #end if
 #if $annotation['links_file'].dataset:
-links = ${seq_count}.links.${annotation['links_file'].extension}
+links = ${spec_count}.links.${annotation['links_file'].extension}
 #end if
 #if $annotation['underlays_file'].dataset:
-underlays = ${seq_count}.underlays.${annotation['underlays_file'].extension}
+underlays = ${spec_count}.underlays.${annotation['underlays_file'].extension}
 #end if
 #if $annotation['highlights_file'].dataset:
-highlights = ${seq_count}.highlights.${annotation['highlights_file'].extension}
+highlights = ${spec_count}.highlights.${annotation['highlights_file'].extension}
 #end if
 offset = $annotation['offset']
 
+#set $seq_count = $seq_count + 1
+#end for
 #end for
 </configfile>
     <configfile name="filenames_file">
-#for $seq_count, $annotation in $enumerate( $annotations ):
+#for $spec_count, $annotation in $enumerate( $annotations ):
 #if $annotation['exons_file'].dataset:
-$annotation['exons_file'] = ${seq_count}.exons.${annotation['exons_file'].extension}
+$annotation['exons_file'] = ${spec_count}.exons.${annotation['exons_file'].extension}
 #end if
 #if $annotation['repeats_file'].dataset:
-$annotation['repeats_file'] = ${seq_count}.repeats.${annotation['repeats_file'].extension}
+$annotation['repeats_file'] = ${spec_count}.repeats.${annotation['repeats_file'].extension}
 #end if
 #if $annotation['links_file'].dataset:
-$annotation['links_file'] = ${seq_count}.links.${annotation['links_file'].extension}
+$annotation['links_file'] = ${spec_count}.links.${annotation['links_file'].extension}
 #end if
 #if $annotation['underlays_file'].dataset:
-$annotation['underlays_file'] = ${seq_count}.underlays.${annotation['underlays_file'].extension}
+$annotation['underlays_file'] = ${spec_count}.underlays.${annotation['underlays_file'].extension}
 #end if
 #if $annotation['highlights_file'].dataset:
-$annotation['highlights_file'] = ${seq_count}.highlights.${annotation['highlights_file'].extension}
+$annotation['highlights_file'] = ${spec_count}.highlights.${annotation['highlights_file'].extension}
 #end if
 #end for
 </configfile>