Functions in the engulfment of cell corpses during embryonic programmed cell death to translocate molecules that mediate homotypic adhesion between cell surfaces of the dying and engulfing cells. Experimental confirmation may be lacking for some isoforms. Ubiquitous in embryos. Expressed in larval germline precursors. Expression in larvae and adults is seen in amphid sheath cells, pharyngeal-intestinal valve and phasmid sheath cells. Low levels of expression are also seen in gonadal sheath cells. Multifunctional polypeptide with two homologous halves, each containing a hydrophobic membrane-anchoring domain and an ATP binding cassette (ABC) domain. Belongs to the ABC transporter superfamily. ABCA family.