if you have learned university biology, you will find there never can be a longest word in English, let me give you an example:
methionylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanyl-
glutaminylleucyllysylglutamylarginyllysylglutamylglycylalanylphenylalanylvalyl-
prolyphenylalanylvalythreonylleucylglycylaspartylprolylglycylisoleucyl-
glutamylglutaminylserylleucyllysylisoleucylaspartylthreonylleucylisoleucyl-
glutamylalanylglycylalanylasparthlalanylleucylglutamylleucylglycylisoleucylprolyl-
phenylalanylserylaspartylprolylleucylalanylaspartylglycylprolylthreonylisoleucyl-
glutaminylaspfraginylalanylthreonylleucylarfinylalanylphenylalanylalanylalanyl-
glycylvalythreonylprolylalanylglutaminylcysteinylphenylalanylglutamylmethionylleu-
cylalanylleuoylisoleucylarginylglutaminyllysyhistidylprolylthreonylisoleucylprolyli-
soleucylglycylleucylmethionyltyrosylalanylasparaginylleucylvalylphenylalany-
lasparaginyllysyglycylisoleucylaspartylglutamylphenylalanylthrosylalanyl-
glutaminylcysteinylglutamyllysylvalylglycylvalylaspartylserylvalylleucylval-
ylalnylaspartylvalylprolylvalylglutaminylglutamylserylalanylprolylphenylalanylarginyl-
glutaminylalanylalanylleucylarginylhistidylasparaginyvalylalanylprolylisoleucyl-
prolylisoleucylphenylalanylisoleucylphenylalanylisoleucylcysteinylprolylproly-
laspartylalanylaspartylaspartylaspartylleucylleucylarginylglutaminylisoleucy-
lalanylseryltyrosylglycylarginylglycyltyrosylthreonyltyrosylleucylleucylsery-
larginylalanylglycylvalylthreonylglycylalanylglutamylasparainylarginylalanylalanylleucyl-
prolylleucylasparaginylhistidylleucylvalylalanyllysylleucyllysylglutamyltyrosylasparaginy-
lalanylalanylprolylprolylleucylglutaminylglgycylphenylalanylglycylisoleucylserylalanylproly-
laspartylglutaminylvalyllysylalanylalanylisoleucylaspartylalanylglycylalanylalanylgly-
cylalanylisoleucylserylglycylserylalanylisoleucylvalyllysylisoieucylisoleucylglutamyl-
glutaminylhistidylasparaginylisoleucylglutamylprolylglutamyllysylmethionylleucylalaalanylleucyllysylvalylphenylalanylcalylglutaminylprolylmethionlysylalanylalanylthreony
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