GcT (Toulouse): a fast variant of the groupspecific system in an Pyrenean family.

In the course of a genetic investigation carried out in a Pyrenean population, a family with a new allele of the Gc system was found. Electrophoretic analysis revealed a faster migrating variant with a double band pattern. Presumably, this variant represents a mutant of the Gc1 allele. The variant is transmitted as an autosomal codominant trait. This additional allele at the Gc locus is named GcT (TcToulouse).