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Cloning and sequencing of POU-boxes expressed in mouse testis.

We have cloned and sequenced four POU-box containg genes expressed in mouse testis. Three of these code for the mouse homologues of the previously described human Oct-I (1), Oct-2 (2) and rat Brn-3 (3). A fourth, here called Oct-I 1 codes for a protein identical to Oct-I and Oct-2 over the entire POU-specific domain and is closely related over the POU-homeodomain. Using cDNA prepared from mouse testis and degenerate PCR primers we have derived the sequence for all four POU-boxes from at least two PCR products. Oct-I and Oct-I 1 were confirmed by a cDNA library. Interestingly, mouse and human Oct-I differ at a position (amino acid 113) which is potentially important for