The function of RELL1 (RELT like 1, ENSG00000181826) is as follows. Induces activation of MAPK14/p38 cascade, when overexpressed (PubMed:28688764). Induces apoptosis, when overexpressed (PubMed:19969290). {ECO:0000269|PubMed:19969290, ECO:0000269|PubMed:28688764}.