THY1 and Graves ophthalmopathy: Khoo et al. [23] reported that the proportion of orbital Thy-1-positive cells increased from 66.8% (range, 63.3%–71.0%) in normal fibroblast cultures to 77.9% (range, 66.5%–84.8%) in cultured orbital fibroblasts from patients with Grave’s ophthalmopathy.