Ubiquitin-like modifier involved in autophagosome formation. Whereas LC3s are involved in elongation of the phagophore membrane, the GABARAP/GATE-16 subfamily is essential for a later stage in autophagosome maturation (By similarity). . This is the function of Ensembl gene identifier ENSG00000238244 (GABARAPL3, GABA type A receptor associated protein like 3 (pseudogene)).