Stock Photo: BIOLOGY LABORATORY. Photo essay in a medically assisted procreation centre at the Pierre Rouques hospital ´Les Bluets´, Paris, France. Incubators in which develop zygotes obtained by ICSI. After 2 to 5 days of incubation, the embryos have become blastocysts and can be transfered in the uterus of the woman. Here, incubators intended for fifteen couples.