pikers.

methionylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanyl-
glutaminylleucyllysylglutamylarginyllysylglutamylglycylalanylphenylalanyl-
valylprolylphenylalanylvalylthreonylleucylglycylaspartylprolylglycyl-
isoleucylglutamylglutaminylserylleucyllysylisoleucylaspartylthreonylleucyl-
isoleucylglutamylalanylglycylalanylaspartylalanylleucylglutamylleucyl-
glycylisoleucylprolylphenylalanylserylaspartylprolylleucylalanylaspartyl-
glycylprolylthreonylisoleucylglutaminylasparaginylalanylthreonylleucyl-
arginylalanylphenylalanylalanylalanylglycylvalylthreonylprolylalanyl-
glutaminylcysteinylphenylalanylglutamylmethionylleucylalanylleucyl-
isoleucylarginylglutaminyllysylhistidylprolylthreonylisoleucylprolyl-
isoleucylglycylleucylleucylmethionyltyrosylalanylasparaginylleucylvalyl-
phenylalanylasparaginyllysylglycylisoleucylaspartylglutamylphenylalanyl-
tyrosylalanylglutaminylcysteinylglutamyllysylvalylglycylvalylaspartylseryl-
valylleucylvalylalanylaspartylvalylprolylvalylglutaminylglutamylseryl-
alanylprolylphenylalanylarginylglutaminylalanylalanylleucylarginylhistidyl-
asparaginylvalylalanylprolylisoleucylphenylalanylisoleucylcysteinylprolyl-
prolylaspartylalanylaspartylaspartylaspartylleucylleucylarginylglutaminyl-
isoleucylalanylseryltyrosylglycylarginylglycyltyrosylthreonyltyrosylleucyl-
leucylserylarginylalanylglycylvalylthreonylglycylalanylglutamylasparaginyl-
arginylalanylalanylleucylprolylleucylasparaginylhistidylleucylvalylalanyl-
lysylleucyllysylglutamyltyrosylasparaginylalanylalanylprolylprolylleucyl-
glutaminylglycylphenylalanylglycylisoleucylserylalanylprolylaspartyl-
glutaminylvalyllysylalanylalanylisoleucylaspartylalanylglycylalanylalanyl-
glycylalanylisoleucylserylglycylserylalanylisoleucylvalyllysylisoleucyl-
isoleucylglutamylglutaminylhistidylasparaginylisoleucylglutamylprolyl-
glutamyllysylmethionylleucylalanylalanylleucyllysylvalylphenylalanylvalyl-
glutaminylprolylmethionyllysylalanylalanylthreonylarginylserine

(that's 1913 letters)

http://en.wikipedia.org/wiki/Methionylglutaminy...serine