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. 1998 Sep 7;142(5):1337–1345. doi: 10.1083/jcb.142.5.1337

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Chemoattraction assay. (A) Ret9 cells adjacent to a GDNF bead at 1 d in culture. (B) Same view as A after 3 d. (C) KM cells adjacent to a GDNF bead at 1 d in culture. (D) Same area as C after 3 d. (E) High magnification of Ret9 cells attached to a GDNF bead after 4 d in culture. (F) Ret9 cells do not attach to a BSA-coated bead after 4 d. (G) E11 kidney rudiment cultured for 2 d with a GDNF bead (outlined) at one side of the ureteric bud. Note ectopic branch coming from the stalk of the ureter (arrow), where branches are normally not seen. (H) E11 kidney cultured for 2 d with a BSA bead (outlined) at one side.