Assertion: exogenous methionine | /r/HasProperty | required for ts formation
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Source sentences:
text: Given that 5-methyltetrahydrofolate is the immediate upstream one-carbon donor for de novo methionine synthesis, we asked whether the decreased 5-methyltetrahydrofolate production in glioblastoma (GBM) tumor spheres (TS) could underlie the reason why exogenous methionine is required for TS formation.