ACTA1 and Sjogren syndrome: In addition, we reported that HSP47-expressing fibroblasts in the periductal area show almost no α-SMA staining in serial sections of the cGVHD lacrimal gland, and that primary fibroblast cultures derived from the cGVHD lacrimal gland show higher HSP47 mRNA expression, but lower levels of α-SMA mRNA and protein expression, and fewer α-SMA-positive cells than do fibroblasts isolated from Sjögren's syndrome patients (used as a control for cGVHD in the article).