Fig. 4. Kinetics of HyBra1 and HyBra2 expression during regeneration. Expression of HyBra1 (dashed line) and HyBra2 (solid line) during head regeneration following bisection at (A) the upper end of the body column, and (B) in the middle of the body column. (C) Expression of the two genes during foot regeneration following bisection in the mid-body column. Data points are means (± s.d.) of 40-80 animals resulting from 2-5 independent experiments. HyBra1 data modified after Technau and Bode (Technau and Bode, 1999).