0000950172-04-003023 SC TO-I/A 2 20041217 20041217 REGENERON PHARMACEUTICALS INC 0000872589 2834 133444607 NY 1231 SC TO-I/A 34 005-41938 041211399 777 OLD SAW MILL RIVER RD TARRYTOWN NY 10591-6707 9143477000 REGENERON PHARMACEUTICALS INC 0000872589 2834 133444607 NY 1231 SC TO-I/A 777 OLD SAW MILL RIVER RD TARRYTOWN NY 10591-6707 9143477000 SC TO-I/A 1 regenamend.txt SC TO-I/A #2 EX-99 2 bos326012.txt EXHIBIT 99(A)(1)(XI)