Low (A) and high power (B) photomicrographs from grafted region of 18 month graft illustrating CD45 immunoreactivity. Intense CD45-labelled inflammatory cells were observed within graft (arrowheads; A). Boxed area in A is enlarged in B showing two types of CD45-positive cells in graft: dark stained round cells with absent processes (arrows; B) associated with blood vessels within the graft, and light stained small cells with present processes (arrowheads; B) distributed either in grafted region or non-grafted putamen. Scale bars = 400 µm (A); 40 µm (B).