Fig. 7: The birth time points and the numbers of newborn rabbits after different treatments in the five different groups.

a Timeline of the experimental steps in the mating assessment. The arrows indicate the birth time points of newborn rabbits in the vector group (blue arrows) and the mHIF-1α group (red arrows). CC, corpus cavernosa. b The baby rabbits were born in one cage of the mHIF-1α group within after 2 months of the mating assessment. c The numbers of newborn rabbits in each group within 4 months of the mating assessment test (n = 5).