the mutants can be divided into at least three groups : ( 1 ) a mutant ( lam 16 ) strain that seems to block normal penetration of phage dna : ( 2 ) three mutant ( lam 64 , lam 67 and lam 71 ) strains that block an `` '' early '' '' step ( s ) of phage growth , including phage dna synthesis : ( 3 ) six mutant ( lam 24 , lam 25 , lam 26 , lam 27 , lam 646 and lam 6 ) strains that block normal functioning of the gene e products and produce unusual head structures .
C0012854
dna
C0598312
e dna synthes