preferred_name: Two DITs combine to form thyroxine (Caenorhabditis elegans)
preferred_name_lc: two dits combine to form thyroxine (caenorhabditis elegans)
label: Two DITs combine to form thyroxine (Caenorhabditis elegans)
label_lc: two dits combine to form thyroxine (caenorhabditis elegans)