Schematic representation of the PCR products amplified by using cps19f primers. The cps19f genes which hybridized (at high stringency) to type 19A chromosomal DNA are shown in black, and the remainder of the locus is shown in grey. (A) Primers used to amplify the cps19a locus. (B) The cps19a locus. Regions with >95% nucleotide sequence identity with the cps19f locus are shown in black. Regions with 90 to 95% identity are shown in dark grey, and regions with 70 to 90% identity are shown in light grey. Restriction sites are as follows: Nc, NcoI; C, ClaI; H, HindIII; B, BAMHI; Nr, NruI; S, SphI; P, PstI; K, KpnI; E, EcoRI.