Histopathology of spleen and bone marrow: H&E staining of representative spleen (A to C) and bone marrow (D to F) sections obtained on day 24 from a monkey infected with only B. microti (monkey Ri201046) (A and D), a monkey infected with both parasites (monkey Ri205138) (B and E), and a monkey infected with only P. cynomolgi (monkey Ri201112) (C and F). WP, white pulp; RP, red pulp from the spleen. The arrowheads indicate bone marrow macrophages containing pigment. Magnification, ×40. Bars = 50 μm.