preferred_name: PGE2 is converted to PGF2a by CBR1 (Xenopus tropicalis)
preferred_name_lc: pge2 is converted to pgf2a by cbr1 (xenopus tropicalis)
label: PGE2 is converted to PGF2a by CBR1 (Xenopus tropicalis)
label_lc: pge2 is converted to pgf2a by cbr1 (xenopus tropicalis)