North Chicago, Illinois-based biopharmaceutical company AbbVie Inc. said March 4 it will buy Sunnyvale, California-based Pharmacyclics, which specializes in cancer treatment, for $21 billion.

AbbVie is being represented by a team from Wachtell, Lipton, Rosen & Katz led by corporate partners Edward Herlihy, David Karp and David Lam. The team also includes antitrust partner Joseph Larson, executive compensation and benefits partner David Kahan, finance partners Joshua Feltman and Gregory Pessin and tax partner Joshua Holmes. Associates working on the deal include Michael Benn, Jeffrey Lee, Jenna Levine, Kate Napalkova, S. Iliana Ongun, Elina Tetelbaum, Lauren Thomas and Alisha Turak.