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In the last decade the novel receptor-like protein tyrosine phosphatase was identified and termed osteotesticular tyrosine phosphatase (OST-PTP) due to its restricted expression in bone and testis. OST-PTP expression is regulated during osteoblast differentiation and it shows stage specific expression in the testis. Confined OST-PTP expression in the basal compartment of the seminiferous tubules suggests...
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