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Polymerase chain reaction for the studies of extracellular superoxide dismutase polymorphism in the blood samples of controls and usual interstitial pneumonia patients. Lane 1 contains a size marker with bands of 25, 50, 75 and 100 bp. Lane 2 is negative control. Lane 3 represents a heterozygous for the minor Gly213 allele with Mwo1-digested products of 28, 35 and 63 bp. Lane 4 contains a homozygous sample for the major Arg213 allele with digested products of 28 and 35 bp.
