A weak human MLR locus mapping at the right of a crossing-over between HLA-D, Bf and GLO.

An unexpected MLR reaction has been observed between three HLA-identical sibs; it consists of bidirectional positive MLR between identical female twins and a sister. No argument for a lymphoid mosaic could be found, although twins were frequent in the family; similarly no HLA-A/B or HLA-B/D recombinant could be demonstrated. The MLR, although weak, was highly reproducible. PLTs could be raised between the sibs, without an apparent segregation in this family nor in five other families, but such PLTs discriminated well between the positive and negative controls. In the absence of any proof that such a weak MLR locus could be on another chromosome than chromosome 6, two lines of argument are indirect evidences that such a locus could be indeed on chromosome 6: one of the sibs differs from the two others for two markers outside HLA--D--DR--Bf: glyoxalate (GLO) and red blood group P.