NORTH CHICAGO, Ill. and SOUTH SAN FRANCISCO, Calif., April 21, 2016 /PRNewswire/ — AbbVie (NYSE: ABBV) and CytomX Therapeutics, Inc. (Nasdaq: CTMX) today announced that they have entered into a collaboration to co-develop and co-commercialize Probody™ Drug Conjugates against CD71, also known as transferrin receptor 1 (TfR1). CD71 is highly …