1  2  3 

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3  _  _  _


ACROSS
1)  a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
2)  the upper side of the thighs of a seated person
3)  an enzyme found in mammals that can catalyze the deamination of adenosine into inosine and ammonia


DOWN
1)  a flat wing-shaped process or winglike part of an organism
2)  a slight amount or degree of difference
3)  a health resort near a spring or at the seaside

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