Griffin et al. Journal of Experimental & Clinical Assisted Reproduction 2006 3:2   doi:10.1186/1743-1050-3-2
Figure 2	Resolution: standard / high

Follicular Stages of Maturation. Depiction of representative primordial (pig) (a), primary (pig) (b), preantral (hamster) (c), incipient antral (mouse) (d), small antral (hamster) (e) and Graafian (pig) (f) follicles.