CAAXpää
CAAXpää is a term used in bioinformatics and molecular biology to describe a specific post-translational modification site found in certain proteins. The "CAAX" part refers to a consensus sequence of amino acids where C represents cysteine, A represents an aliphatic amino acid (such as alanine, valine, leucine, or isoleucine), and X represents any amino acid. The "pää" is a Finnish word meaning "head," and in this context, it signifies the N-terminus of a protein or a specific region within it.
This CAAX motif is crucial for prenylation, a process where a lipid molecule, typically farnesyl pyrophosphate