The longest word in the English language is the chemical name for the "Tryptophan Synthetase" protein and is 1909 letters long !!
I can't pronounce it though
methionylglutaminylarginyltyrosylglutamylserylleucylphenylalany
lalanylglutaminylleucyllysylglutamylarginyllysylglutamylglycylalany
lphenylalanylvalylprolylphenylalanylvalylthreonylleucylglycylaspa
rtylprolylglycylisoleucylglutamylglutaminylserylleucyllysylisoleu
cylaspartylthreonylleucylisoleucylglutamylalanylglycylalanylaspar
tylalanylleucylglutamylleucylglycylisoleucylprolylphenylalanylser
ylaspartylprolylleucylalanylaspartylglycylprolylthreonyliso
leucylglutaminylaspfraginylalanylthreonylleucylarginylalanylpheny
lalanylalanylalanylglycylvalylthreonylprolylalanylglutaminylcyste
inylphenylalanylglutamylmethionylleucylalanylleucylisoleucylargin
ylglutaminyllysylhistidylprolylthreonylisoleucylprolylisoleucylgl
ycylleucylleucylmethionyltyrosylalanylasparaginylleucylvalylpheny
lalanylasparaginyllysylglycylisoleucylaspartylglutamylphenylalany
ltyrosylalanylglutaminylcysteinylglutamyllysylvalylglycylva
lylaspartylserylvalylleucylvalylalanylaspartylvalylprolylvalylglu
taminylglutamylserylalanylprolylphenylalanylarginylglutaminylalan
ylalanylleucylarginylhistidylasparaginylvalylalanylprolylisoleucy
lphenylalanylisoleucylcysteinylprolylprolylaspartylalanylaspartyl
aspartylaspartylleucylleucylarginylglutaminylisoleucylalanylseryl
tyrosylglycylarginylglycyltyrosylthreonyltyrosylleucylleucylseryl
arginylalanylglycylvalylthreonylglycylalanylglutamylasparag
inylarginylalanylalanylleucylprolylleucylasparaginylhistidylleucy
lvalylalanyllysylleucyllysylglutamyltyrosylasparaginylalanylalany
lprolylprolylleucylglutaminylglycylphenylalanylglycylisoleucylser
ylalanylprolylaspartylglutaminylvalyllysylalanylalanylisoleucylas
partylalanylglycylalanylalanylglycylalanylisoleucylserylglycylser
ylalanylisoleucylvalyllysylisoleucylisoleucylglutamylglutaminylhi
stidylasparaginylisoleucylglutamylprolylglutamyllysylmethio
nylleucylalanylalanylleucyllysylvalylphenylalanylvalylglutaminylp
rolylmethionyllysylalanylalanylthreonylarginylserine.
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