Morphological regeneration of the left lobe occurs in neonatal mice. Hematoxylin and eosin (H&E) stains of the mouse liver at 7, 35, and 56 d postresection from pups undergoing surgery on day 0 (A) or day 14 (C). Arrows denote area of amputation. Higher magnification of trichrome-stained sections focused on injury sites from day 0 mice undergoing surgery (B) and day 14 mice undergoing surgery (D) followed by 7, 35, and 56 d of recovery. (Scale bars, 50 μm.)