I'm familiar with the lac operon, but I'm looking at plasmid maps and seeing various annotations that confuse me. Does anyone have a guide to these?

Why does it say PLlacO instead of pLacO? Extra L?

Is pLlacO-1 the constitutive expression variant LacO- listed here [http://www.ndsu.edu/pubweb/~mcclean/plsc431/prokaryo/prokaryo2.htm]?

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