Fig. 5.

H&E (hematoxylin–eosin) staining of the four groups. a0–a2 HE staining of the cranial defect location repaired by Fetal-TEBG in young goats. b0–b2 HE staining of the cranial defect location repaired by Fetal-TEBG in aged goats. c0–c2 HE staining of the cranial defect location repaired by Control DBM scaffold in young goats. d0–d2 HE staining of the cranial defect location repaired by Control DBM scaffold in aged goats. (yellow arrow: bony tissue; blue arrow: fibrous connective tissue) Scale bar: (a0, b0, c0, d0) 500 μm; (a1, a2, b1, b2, c1, c2, d1, d2) 50 μm