Reference for Chullin 110:49

אמר רב נחמן בר יצחק

R'Jannai son of R'Ishmael raised this question: What if the skin along the entire backbone was gone but all the rest of it remained, or if the skin at the navel was gone but all the rest of it remained, or if the skin at the top of each joint was gone but all the rest of it remained? - This remains undecided.

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