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Fetal tibia fluorescence detection. (A) The fetal tibia longitudinal section (Cal: injected with calcein, n = 8; Cal + TC: injected with calcein and tetracycline, n = 8). (B) The fetal tibia transverse section (Cal: injected with calcein, n = 8; Cal + TC: injected with calcein and tetracycline, n = 8). Calcein exhibits green fluorescence (Em: 514 nm/Ex: 475 nm) and tetracycline shows red fluorescence (Em: 603 nm/Ex: 555 nm).
