the phage t4 thymidylate synthase ( td ) gene contains an intron open reading frame that encodes a 245-amino acid-long basic protein ( chu , f. k. , maley , g. f. , west , d. k. , belfort , m. , and maley , f. ( 1986 ) cell 45 , 157-166 ) .
C0021920
intron
C0007634
cell