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Immunohistochemistry demonstrating DDR1 protein in germ cells and peritubular connective tissue from testis biopsy from man with NOA and hypospermatogenesis at low power 100x (A) and high power 400x (B) and decreased expression of DDR1 protein in man with Maturation arrest histology (D). Lack of DDR1 staining is demonstrated in negative controls (C and E).
