In a move that caught many by surprise, the FDA late Tuesday approved Mylan NV’s generic version of Copaxone (glatiramer acetate injection), both the 40-mg and 20-mg formulations, sending shares of Mylan (NASDAQ:MYL) up 16 percent. The Hertfordshire, U.K.-based firm said it planned to begin shipping its AP-rated – i.e. substitutable – versions of the relapsing multiple sclerosis drug “imminently.”