トリプトファン合成酵素の一つは
Methionyl­glutaminyl­arginyl­tyrosyl­glutamyl­seryl­leucyl­phenyl­alanyl­alanyl­glutaminyl­leucyl­lysyl­glutamyl­arginyl­lysyl­glutamyl­glycyl­alanyl­phenyl­alanyl­valyl­prolyl­phenyl­alanyl­valyl­threonyl­leucyl­glycyl­aspartyl­prolyl­glycyl­isoleucyl­glutamyl­glutaminyl­seryl­leucyl­lysyl­isoleucyl­aspartyl­threonyl­leucyl­isoleucyl­glutamyl­alanyl­glycyl­alanyl­aspartyl­alanyl­leucyl­glutamyl­leucyl­glycyl­isoleucyl­prolyl­phenyl­alanyl­seryl­aspartyl­prolyl­leucyl­alanyl­aspartyl­glycyl­prolyl­threonyl­isoleucyl­glutaminyl­asparaginyl­alanyl­threonyl­leucyl­arginyl­alanyl­phenyl­alanyl­alanyl­alanyl­glycyl­valyl­threonyl­prolyl­alanyl­glutaminyl­cysteinyl­phenyl­alanyl­glutamyl­methionyl­leucyl­alanyl­leucyl­isoleucyl­arginyl­glutaminyl­lysyl­histidyl­prolyl­threonyl­isoleucyl­prolyl­isoleucyl­glycyl­leucyl­leucyl­methionyl­tyrosyl­alanyl­asparaginyl­leucyl­valyl­phenyl­alanyl­asparaginyl­lysyl­glycyl­isoleucyl­aspartyl­glutamyl­phenyl­alanyl­tyrosyl­alanyl­glutaminyl­cysteinyl­glutamyl­lysyl­valyl­glycyl­valyl­aspartyl­seryl­valyl­leucyl­valyl­alanyl­aspartyl­valyl­prolyl­valyl­glutaminyl­glutamyl­seryl­alanyl­prolyl­phenyl­alanyl­arginyl­glutaminyl­alanyl­alanyl­leucyl­arginyl­histidyl­asparaginyl­valyl­alanyl­prolyl­isoleucyl­phenyl­alanyl­isoleucyl­cysteinyl­prolyl­prolyl­aspartyl­alanyl­aspartyl­aspartyl­aspartyl­leucyl­leucyl­arginyl­glutaminyl­isoleucyl­alanyl­seryl­tyrosyl­glycyl­arginyl­glycyl­tyrosyl­threonyl­tyrosyl­leucyl­leucyl­seryl­arginyl­alanyl­glycyl­valyl­threonyl­glycyl­alanyl­glutamyl­asparaginyl­arginyl­alanyl­alanyl­leucyl­prolyl­leucyl­asparaginyl­histidyl­leucyl­valyl­alanyl­lysyl­leucyl­lysyl­glutamyl­tyrosyl­asparaginyl­alanyl­alanyl­prolyl­prolyl­leucyl­glutaminyl­glycyl­phenyl­alanyl­glycyl­isoleucyl­seryl­alanyl­prolyl­aspartyl­glutaminyl­valyl­lysyl­alanyl­alanyl­isoleucyl­aspartyl­alanyl­glycyl­alanyl­alanyl­glycyl­alanyl­isoleucyl­seryl­glycyl­seryl­alanyl­isoleucyl­valyl­lysyl­isoleucyl­isoleucyl­glutamyl­glutaminyl­histidyl­asparaginyl­isoleucyl­glutamyl­prolyl­glutamyl­lysyl­methionyl­leucyl­alanyl­alanyl­leucyl­lysyl­valyl­phenyl­alanyl­valyl­glutaminyl­prolyl­methionyl­lysyl­alanyl­alanyl­threonyl­arginyl­serine
で 1913 文字であり、書籍「クレイジー・イングリッシュ」において最長の単語とされている。

タバコモザイクウイルスのカプシドタンパク質である
Acetyl­seryl­tyrosyl­seryl­isoleucyl­threonyl­seryl­prolyl­seryl­glutaminyl­phenyl­alanyl­valyl­phenyl­alanyl­leucyl­seryl­seryl­valyl­tryptophyl­alanyl­aspartyl­prolyl­isoleucyl­glutamyl­leucyl­leucyl­asparaginyl­valyl­cysteinyl­threonyl­seryl­seryl­leucyl­glycyl­asparaginyl­glutaminyl­phenyl­alanyl­glutaminyl­threonyl­glutaminyl­glutaminyl­alanyl­arginyl­threonyl­threonyl­glutaminyl­valyl­glutaminyl­glutaminyl­phenyl­alanyl­seryl­glutaminyl­valyl­tryptophyl­lysyl­prolyl­phenyl­alanyl­prolyl­glutaminyl­seryl­threonyl­valyl­arginyl­phenyl­alanyl­prolyl­glycyl­aspartyl­valyl­tyrosyl­lysyl­valyl­tyrosyl­arginyl­tyrosyl­asparaginyl­alanyl­valyl­leucyl­aspartyl­prolyl­leucyl­isoleucyl­threonyl­alanyl­leucyl­leucyl­glycyl­threonyl­phenyl­alanyl­aspartyl­threonyl­arginyl­asparaginyl­arginyl­isoleucyl­isoleucyl­glutamyl­valyl­glutamyl­asparaginyl­glutaminyl­glutaminyl­seryl­prolyl­threonyl­threonyl­alanyl­glutamyl­threonyl­leucyl­aspartyl­alanyl­threonyl­arginyl­arginyl­valyl­aspartyl­aspartyl­alanyl­threonyl­valyl­alanyl­isoleucyl­arginyl­seryl­alanyl­asparaginyl­isoleucyl­asparaginyl­leucyl­valyl­asparaginyl­glutamyl­leucyl­valyl­arginyl­glycyl­threonyl­glycyl­leucyl­tyrosyl­asparaginyl­glutaminyl­asparaginyl­threonyl­phenyl­alanyl­glutamyl­seryl­methionyl­seryl­glycyl­leucyl­valyl­tryptophyl­threonyl­seryl­alanyl­prolyl­alanyl­serine
は 1185 文字であり、1972年、Chemical Abstracts誌に1単語として登録された。