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Distinct membranous staining was observed in several adenocarcinomas, often accentuated towards luminal membranes. General weak to moderate cytoplasmic staining was displayed in most cancer tissues. Most gliomas, melanomas and skin cancers were negative.
The protein encoded by this gene is an enzyme that catalyzes the conversion of 5-formyltetrahydrofolate to 5,10-methenyltetrahydrofolate, a precursor of reduced folates involved in 1-carbon metabolism. An increased activity of the encoded protein can result in an increased folate turnover rate and folate depletion. Three transcript variants encoding two different isoforms have been found for this gene. [provided by RefSeq, Jun 2011]