Unusual broad substrate spectrum amino acid:sodium cotransporter that promotes absorption of the D isomers of essential amino acids. Neutral amino acids are the preferred substrates, especially methionine and phenylalanine. In larvae, weak specific expression in the anterior midgut just proximal to the gastric caeca reproductive rudiments, common ureters of the Malpighian tubules, and distal swollen portion of the anterior pair of Malpighian tubules. Expression is also seen in the imaginal disks of the head; brain hemispheres and the ventral ganglion. Stronger expression in the posterior midgut. Belongs to the sodium:neurotransmitter symporter (SNF) (TC 2.A.22) family.