monoatomic anion transmembrane transporter activity folic acid transmembrane transporter activity folate:monoatomic anion antiporter activity https://github.com/geneontology/go-ontology/issues/15461 GO:0008518 reduced folate transporter molecular_function folate:anion antiporter activity reduced folate carrier activity TC:2.A.48 Enables the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: Folate derivative (out) + anion (in) = folate derivative (in) + anion (out). The Reduced Folate Carrier (RCF(SLC19A1) acts by an antiport mechanism. RCF carries several folate derivatives: MTX, PMX, ratitrexed, pralatrexate, 5-methyl THF, and 5-formyl THF. reduced folate transmembrane transporter activity antiporter activity