0 7 Altered alter VBN 8 19 DNA-binding dna-binding JJ 20 31 specificity specificity NN 32 39 mutants mutant NNS 40 42 of of IN 43 47 EKLF EKLF NNP 48 51 and and CC 52 55 Sp1 sp1 NN 56 60 show show VBP 61 65 that that IN 66 70 EKLF eklf NN 71 73 is be VBZ 74 76 an an DT 77 86 activator activator NN 87 89 of of IN 90 93 the the DT 94 105 beta-globin beta-globin NN 106 111 locus locus NN 112 119 control control NN 120 126 region region NN 127 129 in in FW 130 134 vivo vivo FW 134 135 . . . 137 140 The the DT 141 146 locus locus NN 147 154 control control NN 155 161 region region NN 162 164 of of IN 165 168 the the DT 169 180 beta-globin beta-globin NN 181 188 cluster cluster NN 189 197 contains contain VBZ 198 202 five five CD 203 208 DNase DNase NNP 209 210 I i CD 211 225 hypersensitive hypersensitive JJ 226 231 sites site NNS 232 233 ( ( ( 233 240 5’HS1-5 5'hs1-5 NN 240 241 ) ) ) 242 250 required require VBN 251 254 for for IN 255 260 locus locus NN 261 271 activation activation NN 271 272 . . . 273 278 5’HS3 5'hs3 NN 279 287 contains contain VBZ 288 291 six six CD 292 298 G-rich g-rich JJ 299 305 motifs motif NNS 306 310 that that WDT 311 314 are be VBP 315 324 essential essential JJ 325 328 for for IN 329 332 its its PRP$ 333 341 activity activity NN 341 342 . . . 343 350 Members member NNS 351 353 of of IN 354 355 a a DT 356 363 protein protein NN 364 370 family family NN 370 371 , , , 372 385 characterized characterize VBN 386 388 by by IN 389 394 three three CD 395 399 zinc zinc NN 400 407 fingers finger NNS 408 414 highly highly RB 415 425 homologous homologous JJ 426 428 to to TO 429 434 those those DT 435 440 found find VBN 441 443 in in IN 444 457 transcription transcription NN 458 464 factor factor NN 465 468 Sp1 sp1 NN 468 469 , , , 470 478 interact interact VBP 479 483 with with IN 484 489 these these DT 490 496 motifs motif NNS 496 497 . . . 498 505 Because because IN 506 511 point point NN 512 523 mutagenesis mutagenesis NN 524 530 cannot cannot MD 531 542 distinguish distinguish VB 543 550 between between IN 551 557 family family NN 558 565 members member NNS 565 566 , , , 567 569 it it PRP 570 572 is be VBZ 573 576 not not RB 577 582 known know VBN 583 588 which which WDT 589 596 protein protein NN 597 606 activates activate VBZ 607 612 5’HS3 5'hs3 NN 612 613 . . . 614 616 We we PRP 617 621 show show VBP 622 626 that that IN 627 630 the the DT 631 639 function function NN 640 642 of of IN 643 647 such such JJ 648 655 closely closely RB 656 663 related related JJ 664 672 proteins protein NNS 673 676 can can MD 677 679 be be VB 680 693 distinguished distinguish VBN 694 696 in in FW 697 701 vivo vivo FW 702 704 by by IN 705 713 matching match VBG 714 719 point point NN 720 729 mutations mutation NNS 730 732 in in IN 733 738 5’HS3 5'hs3 NN 739 743 with with IN 744 749 amino amino JJ 750 754 acid acid NN 755 762 changes change NNS 763 765 in in IN 766 769 the the DT 770 774 zinc zinc NN 775 782 fingers finger NNS 783 785 of of IN 786 789 Sp1 Sp1 NNP 790 793 and and CC 794 798 EKLF EKLF NNP 798 799 . . . 800 807 Testing test VBG 808 813 their their PRP$ 814 822 activity activity NN 823 825 in in IN 826 836 transgenic transgenic JJ 837 841 mice mouse NNS 842 847 shows show VBZ 848 852 that that IN 853 857 EKLF eklf NN 858 860 is be VBZ 861 862 a a DT 863 869 direct direct JJ 870 879 activator activator NN 880 882 of of IN 883 888 5’HS3 5'hs3 NN 888 889 . . .