Fig. 1From: A marker chromosome in post-transplant bone marrowDetection of a marker chromosome in a post-transplant bone marrow specimen. a A marker chromosome of unknown origin, indicated by an arrow, was observed following a sex-mismatched bone marrow transplantation. b FISH using a chromosome 15 centromere probe, labelled in green, showed two copies of chromosome 15 as well as an isodicentric chromosome 15 in a metaphase cellBack to article page