Reference for Bekhorot 78:45

אמר רבי יוסי בן המשולם

OR IF THE TOP END [ROOT] OF THE TAIL DIVIDES THE BONE<span class="x" onmousemove="('comment',' I.e., if the backbone is branched at the place where the tail begins appearing like two tails. Rashi explains 'peels' the backbone, i.e., if the end of the backbone is bare of skin and flesh.');">²⁶</span>

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