Do C57BL/6J (Stock number 000664) mice ever have white hairs in their coat?
C57BL/6J mice will, on occasion, show individual white hairs mixed in their black coat. This is accepted as a strain characteristic and these animals are not culled from our colony. A white tip at the end of the tail is also not uncommon. Animals showing white spotting (larger areas of white hairs) on their bodies would not be considered normal and would be removed from the colony.
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