The function of ENSG00000178038 (ALS2CL, ALS2 C-terminal like) is as follows. Acts as a guanine nucleotide exchange factor (GEF) for Rab5 GTPase. Regulates the ALS2-mediated endosome dynamics. {ECO:0000269|PubMed:15388334, ECO:0000269|PubMed:16473597, ECO:0000269|PubMed:17239822}.