MPSDTFA (MARCKS-ED TFA) is the TFA salt form of MPSD. This compound is a peptide consisting of 25 amino acid residues derived from the effector domain sequence of the endoplasmic reticulum protein myristoylated alanine-rich C-kinase substrate (MARCKS). MPSD TFA is capable of sensing membrane curvature and recognizing phosphatidylserine. It serves as a biological probe for studying membrane morphology and lipid composition.