DNA Expert: Martin's DNA Not Found on Zimmerman's Gun

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SANFORD, Fla. A DNA expert says tests of George Zimmerman's gun revealed the neighborhood watch volunteer's DNA on the firearm's grip - but not Trayvon Martin's.

Florida Department of Law Enforcement DNA expert Anthony Gorgone also testified Wednesday that none of Zimmerman's DNA was found underneath Martin's fingernails.

Prosecutors called the DNA expert to the witness stand to refute Zimmerman's contention that he fatally shot Martin in self-defense. Zimmerman has said Martin was reaching for his firearm during a fight when he fired the gun into Martin's chest.

Zimmerman is pleading not guilty to second-degree murder.

Prosecutors are nearing the end of presenting their case.