May be involved in free fatty acids export from the plastids. Highly expressed during seed development and germination. For all TMEM14 proteins, 4 hydrophobic alpha-helical domains are predicted. However, NMR structure determination of the human TMEM14A showed that only 3 of these helices are membrane-spaning while the amphiphilic N-terminal helix is probably located at the lipid micelle-water interface. Belongs to the TMEM14 family.