"Applied to the anti-assignment provision, the scope of which is limited to wholesaler's rights under the distribution agreement, it becomes evident that the provision has no bearing on wholesaler's antitrust claims, which rely only on statutory rights and do not implicate any substantive right under the distribution agreement. Accordingly, the anti-assignment provision does not invalidate wholesaler's assignment of antitrust claims to Walgreen or otherwise present a bar to Walgreen's standing to assert those antitrust claims against Janssen," Jordan wrote for the panel Friday.