We also showed that fluorogenic peptides that are substrates for PfM1AAP (H-Arg-NHMec and H-Leu-NHMec) and PfM17LAP (H-Leu-NHMec) can passively enter live P. falciparum-infected erythrocytes and allow visualisation of functional aminopeptidase inside the parasite; the results demonstrated aminopeptidase activity within the cytoplasm, and this was inhibited by the aminopeptidase-specific inhibitor bestatin that we previously reported can kill malaria parasites in culture6,7. The gene discussed is CPQ; the disease is malaria.