FIG. 1.
Restriction map of the plasmid clone pSN-1 and its derivatives. The presence (+) or absence (−) of PC-PLC activity is also indicated. Plasmids pSN-1a, -1b, -1c, and -1d were derived from pSN-1 by restriction enzyme digestion at the sites indicated in the map (in nucleotides) and cloned into pKSII(−).