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Stepwise induction of genes for mating and meiosis in S. pombe. The induction of genes necessary for mating and meiosis appears to occur in several steps (steps I to III), all of which require nitrogen-depleted conditions. Ste11 appears to be required for steps I and II. Symbols: +++, full-level induction; ++, induction but not to full level; +, low-level induction; +/−, slight induction; pher, pheromones; N-starv, nitrogen starvation. See the text for details.
