So find the pi value, the isoelectric point of the tripepptide, aspartate glycine and glutamate. So let's begin by drawing our structure for this tripeptide. So on the left side, we have this amino acid. So we have our amino group. So we have h, three n, and this is bound to the central carbon. The central carbon contains an h atom going into the board and the r group, the side chain coming out of the board.