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Message definition (Amino acid ) Many proteins undergo a range of [[posttranslational modification]]s, whereby additional chemical groups are attached to the amino acid residue side chains sometimes producing [[lipoprotein]]s (that are hydrophobic), or [[glycoprotein]]s (that are hydrophilic) allowing the protein to attach temporarily to a membrane. For example, a signaling protein can attach and then detach from a cell membrane, because it contains cysteine residues that can have the fatty acid [[palmitic acid]] added to them and subsequently removed.
多くのタンパク質は様々な翻訳後修飾 を受け、それによってアミノ酸残基の側鎖に追加の化学基が付加され、時にはリポタンパク質 （疎水性）や糖タンパク質 （親水性）を生成し、タンパク質が膜に一時的に付着できるようになる。例えば、シグナル伝達タンパク質は、脂肪酸パルミチン酸 を付加し、その後除去することができるシステイン残基を含むため、細胞膜に付着し、その後剥離することができる。