FK506-induced blastemas are essential to the continuous regeneration of the PCE. (A) Experimental scheme illustrating the FK506 treatment from 0 to 1 dpa and analysis at 5 dpa. (B and C) The FK506 treatment illustrated in A did not induce blastema formation and regeneration of the PCE (n = 6/7). (D) Experimental scheme illustrating the FK506 treatment from 0 to 2 dpa and analysis at 5 dpa. (E and F) The FK506 treatment was continuous up to 2 dpa when PCE blastemas formed (indicated by arrows), which led to the continuous regeneration of the PCE at 5 dpa (n = 5/9). P, proximal; D, distal. (Scale bars: 500 µM.)
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