High affinity cysteine-specific transporter. Major contributor to cysteine transport when cysteine, at low concentrations, is provided as the sole sulfur source. Induced under nitrogen starvation conditions, co-regulated by GCN4 and GLN3. Regulated by the MET4-based sulfur regulatory network. Expression is maximum in nonrepressing sulfur conditions and considerably repressed in the presence of organic sulfur. Induced by chromate. Belongs to the major facilitator superfamily. Allantoate permease family.