Reference for Chullin 185:16

חוטין שביד אסורין

But if it [the fore-limb] was cut and salted it may even [be cooked] in a pot.<span class="x" onmousemove="('comment',' The veins in the fore-limb are forbidden only on account of the blood contained in them; if therefore the meat was cut up and the veins cut too, it is permitted for all purposes.');">⁷</span>

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