Supporting data: A woman aged 20 years anorexia and amenorrhoea. Past history of open-heart surgery. Blood cultures have grown Streptococcus viridans. Hb = 2.8 g/dl. reticulocytes = 0.6% white cells 4.5 x10ˆ9/l. platelets = 25 x10ˆ9/l. Examine the photomicrograph of her bone marrow noting your findings and conclusions.