Sugar transporter involved in the transport of CMP-sialic acid from the cytoplasm into the Golgi (By similarity). Essential protein. Belongs to the nucleotide-sugar transporter family. CMP-Sialate:CMP antiporter (TC 2.A.7.12) subfamily. Was originally thought to correspond to two different genes At4g35330 and At4g35340. Was originally thought to correspond to two different genes At4g35330 and At4g35340. Was originally thought to correspond to two different genes At4g35330 and At4g35340. Was originally thought to correspond to two different genes At4g35330 and At4g35340.