This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Any of many heterodimeric transmembrane proteins that function as receptors in communication between cells.

"In addition, Merck is developing cilengitide, which is the first in a new class of investigational anti-cancer therapies called integrin inhibitors to reach Phase III of development; it is currently being investigated for the treatment of glioblastoma, SCCHN and NSCLC."

integral    integrity    interim    intern