“…The Burg family has been reported before as a second example of Gm(c) occurring in Caucasians [9]. The Klin and the Brea families were studied because in a previous investigation [8] certain of their members had been found t o have some, but to lack other Gm(b) specificities; the Stoe family because the propositus was Gm(c3 + c5 +); and the Hess family because the serum of the propositus contained anti-Gm(c5).…”