CARLSBAD, Calif. & WORCESTER, Mass.--(BUSINESS WIRE)--Invitrogen Corporation (NASDAQ:IVGN), a provider of essential life science technologies for research, production and diagnostics, and CytRx Corporation’s (NASDAQ:CYTR) majority-owned subsidiary RXi Pharmaceuticals Corporation (RXi) today announced that they have entered into an agreement whereby RXi will exclusively license second generation RNA interference (RNAi) technology from Invitrogen for designated target genes in all human therapeutic categories.