This domain is also known as the SWAP domain. SWAP stands for Suppressor-of-White-APricot. It has been suggested that these domains may be RNA binding .
SWAP is derived from the Suppressor-of-White-APricot splicing regulator from Drosophila melanogaster. The domain is found in regulators responsible for pervasive, nonsex-specific alternative pre-mRNA splicing characteristics and has been found in splicing regulatory proteins [PUBMED:8206918]. These ancient, conserved SWAP proteins share a colinearly arrayed series of novel sequence motifs [PUBMED:7971282].