L-serine transmembrane transporter activity obsolete serine transmembrane transporter activity https://github.com/geneontology/go-ontology/issues/24076 https://github.com/geneontology/go-ontology/issues/26052 true OBSOLETE. Enables the transfer of serine from one side of a membrane to the other. Serine is 2-amino-3-hydroxypropanoic acid. GO:0022889 This term was obsoleted because is is redundant with L-serine transmembrane transporter activity ; GO:0015194. molecular_function D-serine transmembrane transporter activity