Uridine is a molecule used in the genetic coding for RNA, choline is in the vitamin B family, and DHA is found in certain fish and fish oils.

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He tested the compound against 80 different RNAsites until he found its perfect match: a 20-unit strip of nucleotides adjacent to the RNA coding region for PKC-alpha.

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It's possible, Gingeras says, that many of these RNA-coding regions regulate how genes make proteins--a function that could make them very important.

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Though the average bacterium has fewer than 5, 000 genes, compared with around 20, 000 protein-coding genes in the average mammal (bacteria do not go in much for RNA-only genes), there are lots of species of bacteria.

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