Comparisons of myosin isoforms A, B and C. Nucleotide (A) and translated amino acid sequences (B) of Doryteuthis pealeii myosin heavy chain isoforms A and B. Isoform B contains a 15-nucleotide (five-amino-acid) deletion and four amino acid substitutions compared with isoform A. Nucleotide (C) and translated amino acid sequences (D) of D. pealeii myosin heavy chain isoforms A and C. Isoform C contains a 36-nucleotide (12-amino-acid) extension compared with isoform A, as well as differences in the stop codon and 3′ UTR. The remainder of the 3′ UTR is not shown because it is the same as that for isoforms A and C. Asterisks (*) denote identical amino acids (or nucleotides), colons (:) denote well-conserved amino acids, periods (.) denote somewhat conserved amino acids, and a blank space denotes no conservation. Nucleotide numbering starts from the start codon.