Sentence:  Due to difficulty culturing the WY-A2 strain in MMH broth, cysteine heart agar with 9% <WSD>chocolatized</WSD> sheep blood (CHAB) was used under identical incubation settings as the strains above. 
Meaning of the word marked with <WSD> tags:  To heat (a substance containing blood) slowly until the red blood cells lyse, producing a brown, chocolate-like color.