The word transgenes 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: 14
Highest Scoring Words With Friends™ Play In The Letters transgenes
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Seven Letter Word Alert: (33 words)
argents, earnest, eastern, enrages, ensears, ensnare, garnets, gearset, grantee, greases, greaten, nearest, neatens, negates, nesters, reagent, regents, regnant, renests, rennets, reseats, resents, restage, sateens, seaters, senates, sensate, stagers, sterane, strange, tanners, teasers, tenners