I am trying to model proteins of the cytochrome oxidase (COX) complex
from a variety of organisms. I followed the "basic tutorial" online and
got great results for the first subunit in the complex (COX1). But, when
I tried the same thing for COX2, the align2d.py script aligns my
sequence against ChainA in the complex instead of ChainB, so I end up
with something that looks like COX1 instead of COX2. This happens even
though I change the "aln.append_model" line in align2d.py to
align_codes='1v54B', instead of 1v54A.