Abstract
Sequences of three cDNA clones for carbonic anhydrase II (CA-II) from chick retina are presented. The longest cDNA clone encodes all but the first three amino acids of CA-II, and the encoded sequence generally agrees with published fragments of CA-II sequence from chick red blood cells. It is 70% identical to human CA-II; the active-site residues are conserved, but the chick protein has six extra cysteines. There is a long 3'-untranslated region which contains a second open reading frame, but this is not conserved. There appears to be a single CA-II gene in the chick. Some anomalies in cDNA synthesis and in Bal31 deletion are noted.
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