Sentence:  In an attempt to reverse the downhill trend by stimulating the bone marrow and controlling any hemolytic <WSD>component</WSD> , triamcinolone , 16 mg. daily , was begun on Sept. 26 , 1958 , and continued until Feb. 18 , 1959 . 
Meaning of the word marked with <WSD> tags:  an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system