In some species of plants the ycf15 gene is probably not a protein-coding gene because the protein in these species has premature stop codons. Most of the members of the family are hypothetical or uncharacterised [1].

1: Complete nucleotide sequence of the chloroplast genome from the Tasmanian blue gum, Eucalyptus globulus (Myrtaceae). Steane DA; DNA Res. 2005;12:215-220. PMID:16303753