Sequence studies of the Fd section of the heavy chain of rabbit immunoglobulin G

A partial amino acid sequence was given by Cebra, Steiner & Porter (1968b) of the N-terminal half of the heavy chain of rabbit immunoglobulin G. This was extended and in part corrected to give a continuous sequence of 136 residues, which together with other work accounts for three-quarters of the total sequence. Evidence is given suggesting that there is a limited region of 10-15 residues that are exceptionally variable in the heavy chains from pooled rabbit immunoglobulin G.