Leishmania Chromosomal Chaos (IMAGE) Institute of Tropical Medicine Antwerp Caption Chromosomes always come in pairs, so the laws of biology say. But the Leishmania parasite is unique in not obeying that rule. Horizontally 17 Leishmania parasite strains that were sequenced, vertically the serial number of the chromosome. The color indicates in how many copies that chromosome appears. No two individual parasites have the same pattern! With ‘normal’ organisms all individuals have the same pattern. Credit Antwerp Institute of Tropical Medicine, Wellcome Trust Sanger institute Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.