Figure 1

Immunohistochemical detection of surfactant protein A (SP-A) in renal tissues. (A) A positive stain was observed in the renal tubular epithelial cells of the proximal and distal convoluted tubules. A polyclonal antibody against human SP-A was used at a dilution of 1:150. (B) Negative control sections from human renal tissues, in which phosphate-buffered saline was used instead of the primary antibody. (C) Alveolar tissues were used as positive controls. A positive stain was observed in alveolar type II cells. Arrows in the figure point at positive staining for SP-A.