Overview of regeneration experiments. Time shift between experiments was three days for sets 1 and 2, as well as eight hours for set 3. At each time point, given number of anterior and posterior regenerating specimens was fixed. The total number is a summation of all specimens fixed in the particular experiments. Please note, that due to the dissection, this number is half of the number of specimens fixed. Additional specimens listed in brackets were dissected in reserve and placed back in a stock aquarium after fixation of the last day or hour