0000950123-04-002555 8-K 2 20040227 5 7 20040301 REGENERON PHARMACEUTICALS INC 0000872589 2834 133444607 NY 1231 8-K 34 000-19034 04637381 777 OLD SAW MILL RIVER RD TARRYTOWN NY 10591-6707 9143477000 8-K 1 y94739e8vk.htm REGENERON PHARMACEUTICALS, INC. EX-99.A 3 y94739exv99wa.htm PRESS RELEASE