Immunogen sequence: MPRKIEEIKD FLLTARRKDA KSVKIKKNKD NVKFKVRCSR YLYTLVITDK EKAEKLKQSL PPGLAVKELK; Positive Samples: A-375, HeLa, MCF-7. Ribosomes, the organelles that catalyze protein synthesis, consist of a small 40S subunit and a large 60S subunit. Tog