Transporter that may play a role in monocyte differentiation and lipid transport and homeostasis. Highly expressed in heart and to lower extent in kidney, brain and spleen (PubMed:12532264). Weakly expressed in developing and adult brains (PubMed:29520568). Weakly expressed in the cerebellar granular layer at P14 and P21 (PubMed:29520568). Detected along the outer surface of the brain or along the fissure of cerebellar lobules at 13 dpc to P21. Down-regulated by digoxin. Belongs to the ABC transporter superfamily. ABCA family.