Mahgoub E S
Sabouraudia. 1978 Sep;16(3):211-6. doi: 10.1080/00362177885380281.
Experiments with athymic nude mice "nu nu" strain showed grains of Madurella mycetomi as early as 9 days, and they were well developed by 21 days, after inoculation. Grains were similar to those of humans, in pigment production and tissue reaction.