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Figure 1 .
mRNA expression of nitric oxide synthase (NOS) isoforms in human rotator cuff bursae by reverse transcriptase-polymerase chain reaction (RT-PCR). Lane MM = DNA molecular markers; lane PC = positive control PCR products for NOS isoforms (inducible NOS (iNOS) = interleukin 1β induced human chondrocytes at 500 bp, endothelial NOS (eNOS) = cultured human umbilical endothelial cells at 471 bp, neuronal NOS (nNOS) = human muscle at 486 bp); lanes 1-17 = PCR products of subacromial bursal samples for NOS isoforms and β-actin (643 bp); lanes A-C = PCR products for β-actin of the positive control samples.