4932441K18Rik may be involved in intracellular vesicle traffic.4932441K18Rik inhibits ATF4-mediated transcription, possibly by dimerizing with ATF4 to form inactive dimers that cannot bind DNA.4932441K18Rik may be involved in regulating bone mass density through an ATF4-dependent pathway. 4932441K18Rik may be involved in cell cycle progression.