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The human pro-collagen I alpha 1 (HuProCol I alpha 1) content in human sorted and cultured CD26-positive, CD26-negative, and unsorted (CD45-CD235a-CD31-) fibroblasts. There was a higher percentage of human pro-collagen I alpha 1 in CD26-positive compared with CD26-negative fibroblasts (P < 0.01**) and in unsorted compared with CD26-negative fibroblasts (P < 0.01**).
