The fission yeast Schizosaccharomyces pombe divides through constriction of an actomyosin-based contractile ring followed by formation and degradation of a medial septum. Formation of an organized septin ring is also important for the completion of S. pombe cell division and this event relies on the production of Mid2p. mid2 + mRNA and protein accumulate in mitosis. Recent microarray analyses identified mid2 + as a target of the Ace2p transcription factor, and ace2 + as a target of the Sep1p transcription fac…
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