PCH4 is an alias for the gene, TRNA splicing endonuclease subunit 54, in humans. Other names include: tRNA-splicing endonuclease subunit Sen54; HsSEN54; tRNA-intron endonuclease Sen54; SEN54 homolog; PCH2A; SEN54L; TSEN54 tRNA splicing endonuclease subunit; sen54. The encoded protein has an amino acid length of 526 and a mass of 58.8 kDa. PCH4 is a member of the SEN54 family. This gene shares homology with other species, including: Mouse, Rat, Zebrafish, Frog, Chicken.