preferred_name: CO binds to free ferrohemoglobin (Xenopus tropicalis)
preferred_name_lc: co binds to free ferrohemoglobin (xenopus tropicalis)
label: CO binds to free ferrohemoglobin (Xenopus tropicalis)
label_lc: co binds to free ferrohemoglobin (xenopus tropicalis)