Fig. 6. Exchange of tail sequences in h2 CaP. Replacement of the h2 CaP tail with that of h1 (h2-h1t) CaP fails to regulate the actin-binding region. Fusion of either the h1 (h2-h1t) or the ac. CaP tail to h2 CaP (h2-act) only partially restores the autoinibition of the h2 tail. Top row, actin visualized by Alexa 568 phalloidin; middle row, GFP fluorescence; bottom row, merged images.