Fig. 1.
Family tree for the Rhnull donor Y.T., showing inheritance of the RH50 allele containing the G836A mutation. PCR products were prepared from genomic DNA using primers D and C that span nt 820 to 908. Primer D has a 12-base tail added. The 101-bp PCR product obtained from each family member was digested withMnlI, and the fragments were analyzed on agarose gel. Products containing the G836 sequence are cut into 22- and 79-bp fragments, whereas those with A836 are uncut. The polymorphism at nt 836 (A or G) is indicated below each family member.