0000950123-04-011352 S-8 3 20040924 20040924 20040924 REGENERON PHARMACEUTICALS INC 0000872589 2834 133444607 NY 1231 S-8 33 333-119257 041045115 777 OLD SAW MILL RIVER RD TARRYTOWN NY 10591-6707 9143477000 S-8 1 y00828sv8.txt REGENERON PHARMACEUTICALS, INC. EX-5.1 2 y00828exv5w1.txt OPINION OF SKADDEN, ARPS, SLATE, MEAGHER & FLOM LLP EX-23.1 3 y00828exv23w1.txt CONSENT OF PRICEWATERHOUSECOOPERS LLP