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Wilehm Roux Arch Dev Biol
1977 Jun 01;1812:189-192. doi: 10.1007/BF00848442.
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Cinematographic Observation of "Post-Fertilization waves" (PFW) on the zygote ofXenopus laevis.
Hara K
,
Tydeman P
,
Hengst RT
.
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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.
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