in all completely homozygous cells and in four heterozygous cells at the a locus , the restriction fragments of the 21-oha ( 3.2 kb ) and c4b ( 5.8 kb or 5.4 kb ) genes were absent , and the fragments of the c4a ( 7.0 kb ) and 21-ohb ( 3.7 kb ) genes were present .
C0007634
cells
C1708726
locus