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Surfactant protein A (SP-A) cDNA segments (a mixture of SP-A1 and SP-A2, 439 bp) from renal tissues, HK-2 cells, and the control alveolar tissues were digested by Apa I. A, SP-A cDNA segments treated with Apa I; P, SP-A cDNA segments untreated with Apa I. SP-A cDNA segments from renal tissues (Lanes 1 and 2) and HK-2 cells (Lanes 3 and 4). SP-A cDNA segments from alveolar tissues were used as positive controls (Lanes 5 and 6).
