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SRY is not the only, or even most common sex-determining gene in mammals (linked to determining males).
Most non-primate mammals use the Y chromosome gene UBE1 for the same purpose.
Two species of "mole voles", Ellobius tancrei and E. lutescens, have lost the Y chromosome entirely.
In one species, both sexes have unpaired X chromosomess; in the other, both females and males have XX.
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