--- biopython-1.43/Bio/SeqUtils/__init__.py.old	2007-12-17 13:21:43.000000000 -0500
+++ biopython-1.43/Bio/SeqUtils/__init__.py	2007-12-17 13:22:31.000000000 -0500
@@ -272,6 +272,11 @@
    " just an alias for six_frame_translations "
    return six_frame_translations(seq, genetic_code)
 
+def complement(seq):
+   " returns the complementary sequence (NOT antiparallel) "
+   return ''.join([IUPACData.ambiguous_dna_complement[x] for x in seq])
+
+
 def six_frame_translations(seq, genetic_code = 1):
    """
    nice looking 6 frame translation with GC content - code from xbbtools