comparison of primary structures of e. coli lac-operon ( distal end of lacz gene , z-y spacer , and proximal end of lacy gene ) described earlier with corresponding segments of bacteriophages lambda ci857 and lambda plac 5-2 dnas sequenced in this paper showed that the bacterial dna insert ends immediately after z-y spacer , just before the initiating triplet atg of lacy gene .
C0012854
dnas
C0012924
bacterial dna