SUMMARYAll classes of molecule postulated to play a role in recognition or to have some structural homology to immunoglobulins were compared by theSΔQindex of differences in amino acid composition. The results suggest that there is a wide family of immunoglobulin‐related molecules that includes vertebrate immunoglobulins, T cell receptors, MHC products, C‐reactive proteins, and (some) invertebrate lec
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