By Dan Levine SAN FRANCISCO (Reuters) – A gay man was improperly excluded from jury service because of his sexual orientation, a federal appeals court has ruled, illustrating the widening influence of a key U.S. Supreme Court decision on gay rights. The 9th U.S. Circuit Court of Appeals in San Francisco on Tuesday ordered a new trial for GlaxoSmithKline Plc against an Abbott Laboratories spinoff because Abbott excluded the potential juror. The case involved Abbott's pricing of HIV medications, a controversial issue in the gay community. Glaxo accused Abbott of improperly hiking the price of one drug, Norvir, to help it preserve sales growth of one of its other HIV blockbusters, Kaletra.