title: Cinematographic Observation of "Post-Fertilization waves" (PFW) on the zygote ofXenopus laevis.
abstract: In fertilizedXenopus eggs, shortly after egg rotation but well before the occurrence of the cleavage-associated "surface contraction waves", two circular dark zones originate consecutively from the pigment spot marking the site of sperm entrance. They expand and travel centrifugally over the egg surface.
authors.affiliation: Hubrecht Laboratory, Uppsalalaan 8, Utrecht, Netherlands.
authors.forename: K
authors.initials: K
authors.lastname: Hara
authors.affiliation: Hubrecht Laboratory, Uppsalalaan 8, Utrecht, Netherlands.
authors.forename: P
authors.initials: P
authors.lastname: Tydeman
authors.affiliation: Hubrecht Laboratory, Uppsalalaan 8, Utrecht, Netherlands.
authors.forename: R T M
authors.initials: RT
authors.lastname: Hengst
keywords: Fertilization; Surface wave; Time-lapse cinematography; Xenopus egg