SUMMARYImmunoglobulin allotypes were studied in a peculiar Breton community, the Bigoudens. Results showed that the incidence of the common Gm and Km phenotypes fell into the ranges quoted for Caucasian populations, except for theGm1;…5,10,11,13,14andGm1,2;…5,10,11,13,14. The frequencies were found to be significantly different from those of non‐Bigouden Breton neighbouring con
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