The word erythropoietin is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 22
Highest Scoring Words With Friends™ Play In The Letters erythropoietin
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Seven Letter Word Alert: (50 words)
entropy, eophyte, epithet, heptyne, heroine, honoree, honorer, hornier, inepter, inerter, inherit, neither, neotype, nitrite, nittier, norther, oophyte, pettier, phonier, pioneer, pithier, pointer, portent, portion, potheen, pottery, prenote, printer, protein, reentry, rehonor, reinter, repiner, repoint, reprint, tentier, terpine, therein, thereon, thereto, thorite, tintier, tiptoer, tornote, torrent, treetop, trinity, trooper, typhoon, yperite