From CTI Goes Up, And Down, And Back Up On Phase 3 Myelofibrosis News:

Myelofibrosis
Myelofibrosis

Myelofibrosis in bone marrow, by Ed Uthman, via a Creative Commons license. https://www.flickr.com/photos/euthman/6032644716/in/photolist-6uCskE-ac5T6N-72kSZL