Immunofluorescent confocal micrograph of a day 10.5 mouse limb bud (blue marks fibroblasts, green indicates epithelial cells, red denotes dividing cells)
From Echevarria-Andino et al., Development, 2020
Skeletal preparation of the cranial vault of a day 18.5 mouse embryo (blue denotes cartilage, while purple indicates mineralized bone)