preferred_name: PC is exchanged with PI by PITPNB (Xenopus tropicalis)
preferred_name_lc: pc is exchanged with pi by pitpnb (xenopus tropicalis)
label: PC is exchanged with PI by PITPNB (Xenopus tropicalis)
label_lc: pc is exchanged with pi by pitpnb (xenopus tropicalis)