摘要：

Presents the first demonstration of phosphotyrosine in `Schizosaccharomyces pombe,' a unicellular organism, by the establishment that `S. pombe' pp34 is phosphorylated on tyrosine as well as on serine and threonine. Dephosphorylation during mitosis; Tyrosine phosphorylation; Tyrosine phosphorylation site; Tyrosine substitutions.

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