Longest word in the world. You ready?

The longest word on planet earth is the name of the tryptophan synthetase A protein. It's 1,913 letters long. Guiness only refers to the word rather than waste a couple of pages offering it, but I got it off the internet. You ready?

The word is

methionylglutaminylarginyltyrosylglutamylserylleuc ylphenylalanylalanyl-

glutaminylleucyllysylglutamylarginyllysylglutamylg lycylalanylphenylalanyl-

valylprolylphenylalanylvalylthreonylleucylglycylas partylprolylglycyl-

isoleucylglutamylglutaminylserylleucyllysylisoleuc ylaspartylthreonylleucyl-

isoleucylglutamylalanylglycylalanylaspartylalanyll eucylglutamylleucyl-

glycylisoleucylprolylphenylalanylserylaspartylprol ylleucylalanylaspartyl-

glycylprolylthreonylisoleucylglutaminylasparaginyl alanylthreonylleucyl-

arginylalanylphenylalanylalanylalanylglycylvalylth reonylprolylalanyl-

glutaminylcysteinylphenylalanylglutamylmethionylle ucylalanylleucyl-

isoleucylarginylglutaminyllysylhistidylprolylthreo nylisoleucylprolyl-

isoleucylglycylleucylleucylmethionyltyrosylalanyla sparaginylleucylvalyl-

phenylalanylasparaginyllysylglycylisoleucylasparty lglutamylphenylalanyl-

tyrosylalanylglutaminylcysteinylglutamyllysylvalyl glycylvalylaspartylseryl-

valylleucylvalylalanylaspartylvalylprolylvalylglut aminylglutamylseryl-

alanylprolylphenylalanylarginylglutaminylalanylala nylleucylarginylhistidyl-

asparaginylvalylalanylprolylisoleucylphenylalanyli soleucylcysteinylprolyl-

prolylaspartylalanylaspartylaspartylaspartylleucyl leucylarginylglutaminyl-

isoleucylalanylseryltyrosylglycylarginylglycyltyro sylthreonyltyrosylleucyl-

leucylserylarginylalanylglycylvalylthreonylglycyla lanylglutamylasparaginyl-

arginylalanylalanylleucylprolylleucylasparaginylhi stidylleucylvalylalanyl-

lysylleucyllysylglutamyltyrosylasparaginylalanylal anylprolylprolylleucyl-

glutaminylglycylphenylalanylglycylisoleucylserylal anylprolylaspartyl-

glutaminylvalyllysylalanylalanylisoleucylaspartyla lanylglycylalanylalanyl-

glycylalanylisoleucylserylglycylserylalanylisoleuc ylvalyllysylisoleucyl-

isoleucylglutamylglutaminylhistidylasparaginylisol eucylglutamylprolyl-

glutamyllysylmethionylleucylalanylalanylleucyllysy lvalylphenylalanylvalyl-

glutaminylprolylmethionyllysylalanylalanylthreonyl arginylserine