Skip to main content
. 2006 Apr 25;4(5):e135. doi: 10.1371/journal.pbio.0040135

Figure 1. The MII Oocyte Is Preferentially Fertilized in the pb Half Sphere Independent of Intrinsic Polarity.

Figure 1

(A) Distribution of the site of fertilization with respect to the 2pb in vivo and in vitro after cumulus cell removal. Zones I–VI (depicted in yellow), defined as 30° wide each, categorize the site of fertilization with respect to the 2pb. The proportion of the surface area for each zone is depicted in red.

(B) Distribution of the position of fertilization in vitro after zona pellucida removal.

(C) Distribution of sperm binding to defined regions of the ZP with respect to the meiotic chromosomes at MII stage.

(D) Distribution of the point of ZP penetration by the sperm with respect to the 2pb.

Results are all presented in the order of Zone I to VI. Scale bars represent 20 μm.