Gene nomenclature
Several other genus-specific research communities ( e . g . , "Drosophila" fruit flies , "Mus" mice ) have adopted nomenclature standards , as well , and have published them on the relevant model organism websites and in scientific journals , including the "Trends in Genetics" Genetic Nomenclature Guide . 
<triplet> Drosophila <subj> genus <obj> taxon rank <subj> model organism <obj> instance of