Section X

Xenodiagnosis: Procedure involving the feeding of laboratory-reared triatomid bugs on patients suspected of having Chagas' disease; after several weeks, the feces of the bugs are checked for intermediate stages of Trypanosoma cruzi.

Xenograft: A tissue graft between animals of different species.

Xerophile: An organism adapted to growth at very low water potentials.

X factor: A precursor necessary to synthesize cytochromes.

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