Extensively variable surface antigens of Sarcocystis spp. infecting Brazilian marsupials in the genus Didelphis occur in myriad allelic combinations, suggesting sexual recombination has aided their diversification - Monteiro, R. M; Keid, Lara Borges; Richtzenhain, Leonardo José; Valadas, S. Y. O. B; Muller, G; Soares, Rodrigo Martins (Veterinary Parasitology, 2013)