Reference for Chullin 205:12

בהמה בחייה לאברים עומדת ואיסור טרפה ואיסור אבר בהדי הדדי קאתו

One [R'Johanan] holds that the prohibition of the limb can be superimposed upon the [existing] prohibition of trefah;<span class="x" onmousemove="('comment',' Since the prohibition of the limb severed from a living creature is a grave restriction for it applies to the sons of Noah. V. supra ');">⁵</span>

Jastrow