Anti-thioredoxin like 4A antibodies are used in the immunodetection of the protein encoded by the TXNL4A gene. In humans, the canonical protein has a reported length of 142 amino acid residues and a mass of 16.8 kDa. Its subcellular localization is in the nucleus. A member of the DIM1 protein family, it is known to play a role in pre-mRNA splicing as component of the U5 snRNP and U4/U6-U5 tri-snRNP complexes that are involved in spliceosome assembly, and as component of the precatalytic spliceosome (spliceosome B complex). Other names for this target antigen include DIB1, DIM1, SNRNP15, TXNL4, U5-15kD, thioredoxin-like protein 4A, DIM1 protein homolog, and BMKS.