Mesorat%20hashas for Chullin 249:15

מילי מילי קא משמע לן

But if it is held that the marrow within [the bone] can restore [the flesh] outside it,<span class="x" onmousemove="('comment',' And even if the marrow of a bone in the living animal has entirely wasted away, and the flesh around it has gone, the bone is still regarded as a proper limb, for it is possible for new marrow to form in the bone and to restore the flesh around it.');">⁶</span>

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