Fig. 1

GuHCl induces lysis of trophozoite- and schizont-infected erythrocyte. a Left, supernatants of P. knowlesi-infected (1.1% ring, 1.5% trophozoite, 0.4% schizont) human RBC culture after treatment with PBS, sorbitol, GuHCl, glucose, glycine, or distilled water. Right, supernatant of uninfected RBCs after the same treatments. b Haemoglobin released, quantified by absorbance at 570 nm. c Stage distribution of the parasite before and after each treatment. Data from a single experiment in a