a 23-kilobase ecori dna fragment coding for the balb/c immunoglobulin gamma 2a chain was cloned from mouse embryo dna in the cosmid pjc74 , and a nucleotide sequence of 1904 bases was determined for the entire constant region ( ch1 , ch2 , and ch3 ) , the three intervening sequences ( ivs 1 , ivs 2 , and ivs 3 ) and the 5 ' and 3 ' flanking sequences .
C0000702
a
C0012854
dna