. "\"Catalysis of the transfer of L-proline from one side of a membrane to the other. L-proline is pyrrolidine-2-carboxylic acid.\" [GOC:ai, GOC:mtg_transport, ISBN:0815340729]" . . "L-proline transmembrane transporter activity" . . . . "L-proline permease activity" . "glycine betaine/proline porter activity" . "proline/glycine/betaine:hydrogen/sodium symporter activity" . "L-proline transporter activity" .