diff --git a/python/obitools3/commands/uniq.pxd b/python/obitools3/commands/uniq.pxd
index 3452e17..7402339 100644
--- a/python/obitools3/commands/uniq.pxd
+++ b/python/obitools3/commands/uniq.pxd
@@ -5,4 +5,4 @@ from obitools3.dms.taxo.taxo cimport Taxonomy
 from obitools3.dms.view.typed_view.view_NUC_SEQS cimport View_NUC_SEQS
 
 
-cdef uniqSequence(View_NUC_SEQS view, View_NUC_SEQS o_view, ProgressBar pb, Taxonomy taxonomy=*, list mergedKeys_list=*, bint mergeIds=*, list categories=*)
+cdef uniqSequence(View_NUC_SEQS view, View_NUC_SEQS o_view, ProgressBar pb, list mergedKeys_list=*, Taxonomy taxonomy=*, bint mergeIds=*, list categories=*)
diff --git a/python/obitools3/commands/uniq.pyx b/python/obitools3/commands/uniq.pyx
index 37ff7a5..b7db87a 100644
--- a/python/obitools3/commands/uniq.pyx
+++ b/python/obitools3/commands/uniq.pyx
@@ -2,7 +2,6 @@
 
 from obitools3.apps.progress cimport ProgressBar  # @UnresolvedImport
 from obitools3.dms.dms cimport DMS
-from obitools3.dms.taxo.taxo cimport Taxonomy
 from obitools3.dms.view.view cimport View, Line
 from obitools3.dms.view.typed_view.view_NUC_SEQS cimport View_NUC_SEQS
 from obitools3.dms.column.column cimport Column, Column_line
@@ -59,12 +58,12 @@ def addOptions(parser):
 # TODO taxonomy
 
 
-cdef uniqSequence(View_NUC_SEQS view, View_NUC_SEQS o_view, ProgressBar pb, Taxonomy taxonomy=None, list mergedKeys_list=None, bint mergeIds=False, list categories=None) :
+cdef uniqSequence(View_NUC_SEQS view, View_NUC_SEQS o_view, ProgressBar pb, list mergedKeys_list=None, Taxonomy taxonomy=None, bint mergeIds=False, list categories=None) :
      
     cdef int            i
     cdef int            o_idx
     cdef int            u_idx
-    cdef int            u_id
+    cdef tuple          u_id
     cdef int            i_count
     cdef set            mergedKeys
     cdef dict           uniques
@@ -80,23 +79,26 @@ cdef uniqSequence(View_NUC_SEQS view, View_NUC_SEQS o_view, ProgressBar pb, Taxo
     cdef Column         seq_col
     cdef object         to_merge
     cdef Column_line    mcol
-    cdef Column_line    i_mcol
-        
+    cdef Column_line    i_mcol  
+    cdef list           catl
+    
+    #print(categories)
+    
     uniques = {}
-     
-    if categories is None:
-        categories=[]
     
     if mergedKeys_list is not None:
         mergedKeys=set(mergedKeys_list)
     else:
         mergedKeys=set() 
     
-#    if taxonomy is not None:
-#        mergedKeys.add('taxid')
+    if taxonomy is not None:
+        mergedKeys.add('taxid')
+    
+    if categories is None:
+        categories = []
     
     # Going through columns to merge a first time to create merged columns with the good number of elements per line and elemnts names
-    #logger("info", "obi uniq", "First browsing through the input")
+    logger("info", "First browsing through the input")
     merged_infos = {}
     i = 0
     iter_view = iter(view)
@@ -131,20 +133,28 @@ cdef uniqSequence(View_NUC_SEQS view, View_NUC_SEQS o_view, ProgressBar pb, Taxo
     
     del(merged_infos)
     
-    #logger("info", "obi uniq", "Second browsing through the input")
+    logger("info", "Second browsing through the input")
     i = 0
     o_idx = 0
     seq_col = view[NUC_SEQUENCE_COLUMN]
-        
+    
     iter_view = iter(view)
     for i_seq in iter_view :
         pb(i)
         
-        #u_id = tuple(i_seq[x] for x in categories) + (seq_col.get_line_idx(i),)
-        u_id = seq_col.get_line_idx(i)
+        # This can't be done in the same line as the u_id tuple creation because it generates a bug
+        # where Cython (version 0.25.2) does not detect the reference to the categs_list variable and deallocates 
+        # it at the beginning of the function.
+        # (Only happens if categs_list is an optional parameter, which it is).
+        catl = []
+        for x in categories :
+            catl.append(i_seq[x])    
+        
+        u_id = tuple(catl) + (seq_col.get_line_idx(i),)
+        #u_id = tuple(i_seq[x] for x in categories) + (seq_col.get_line_idx(i),)  # The line that cython can't read properly
         
         if u_id in uniques:
-                        
+            
             if COUNT_COLUMN not in i_seq or i_seq[COUNT_COLUMN] is None:
                 i_count = 1
             else:
@@ -248,9 +258,11 @@ def run(config):
                       input=False,
                       newviewtype=View_NUC_SEQS)
     
+    # TODO exceptions not handled like they should be
+    
     entries = input[1]
     o_view = output[1]
-         
+    
     # Initialize the progress bar
     pb = ProgressBar(len(entries), config, seconde=5)
 
@@ -259,9 +271,14 @@ def run(config):
 #        usm = uniqPrefixSequence
 #    else:
     usm = uniqSequence
-
-    usm(entries, o_view, pb, taxonomy=None, mergedKeys_list=config['uniq']['merge'], mergeIds=config['uniq']['mergeids'], categories=config['uniq']['categories'])       
     
+#     if 'taxoURI' in config['obi'] :   # TODO default None problem
+#         taxo = open_uri(config['obi']['taxoURI'])
+#     else :
+    taxo = None
+
+    usm(entries, o_view, pb, mergedKeys_list=config['uniq']['merge'], taxonomy=taxo, mergeIds=config['uniq']['mergeids'], categories=config['uniq']['categories'])       
+
 #     if 'merge' in config['uniq'] :
 #         merged_keys=set(config['uniq']['merge'])
 #     else: