Humour for Nerds

Today's Grauniad has a story (sorry but I cannot find it online) about graffito in Cambridge. Outside the lab where Watson and Crick discovered DNA (with the help of Rosalind Franklin) someone has painted on the road a diagram of Guanine. The article goes on to say

"Gq - Phospholipase - C
The point may be lost on those who are a little rusty on the interactions of phospholipases and guanine nucleotides; some of the humour, of course, drives from the fact that phospholipase is an enzyme that catalyses the hydrolysis of a phospholid".

I can already hear Jimmy Carr suing Jim Davidson over that one.