第十二个最长的是1,913个字母, 是"色氨酸合成酶A蛋白质" (一种含有267种氨基酸酶)的全称----单词如下: Methionylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalany lglutaminylleucyllysylglutamylarginyllysylglutamylglycylalanylphenyla lanylvalylprolyphenylalanYlvalythreonylleucylglycylaspartylprolylglyc ylisoleucylglutamylglutaminylsErylleucyllysylisoleucylaspartylthreony lleucylIsoleucylglutamylalanylglycylalanylasparthlalanylleucylglutamy lleucylglycylisoleucylprolylphenylalanylseRylaspartylprolylleucylalan ylaspartylglycylpRolylthreOnylisoleucylglutaminylasPfraginylalanylthr eonylleucylarfinylalanylphenylalanylalanylalanylglycylvalythreonylpro lylalanylglutaminylcysteinylphenylalanylglutamylmethionylleucylalanyl leuOylisoleucylarginylglutaminyllysyhistidylprolylthreonylisoleucylpr olylisoleucylglycylleucylmethionyltyrosylalanylasparaginylleucylvalyl phenylalanylasparaginyllysyglycylisoleucylaspartylglutamylphenylalany lthrosylalanylglutaminylcysteinylglutamyllysylvalylglycylvalylasparty lserylvalylleucylvalylalnylaspartylvalylprolylvalylglUtaminylglutamyl serylalanylprolylphenylalanylarginylglutaminylalanylalanylleucylarginy lhistidylasparaginyvalylalanylprolylisoleucylprolylisoleucylphenylalan ylisoleucylphenylalanylisoleucylcysteinylprolylprolylaspartylalanylasp artylaspartylaspartylleucylleucylarginylglutaminylisoleucylalanylseryl tyrosylglycylarginylglycyltyrosylthreonyltyrOsylleucylleucylserylargin ylalanylglycylvalylthreonylglycylalanylglutamYlasparainylarginylalanyl alanylleucylprolylleucylasparaginylhistidylleucylValylalanyllysylleucy llysylglutamyltyrosylasparaginylalanylalanylprolylprolylleucylglutaminy lglgycylphenylalanylglycylisoleucylserylalanylprolylaspartylglutaminylv alyllysylalanylalanylisoleucylaspartylalanylglycylalanylalanylglycylala nylisoleucylserylglycylserylalanylisoleucylvalyllysylisoIeucylisoleucyl glutamylglutaminylHistidylasparaginyliSoleucylglutamylprolylglutamyllys ylmethionylleucylalanylalanylleucyllysylvalylphenylalanylcalylglutaminy lprolylmethionlysylalanylalanylthreonylarginylserine