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- W2093796521 abstract "A study has been made of the fertilization of the lamprey egg, using Lampetra fluviatilis and L. planeri. No differences were found between these two species. 1. The chorion of the egg has no micropyle, but spermatozoan entry is limited to the region of attachment of a tuft of fibrous jelly at the animal pole. 2. At the end of a short swimming life, or on coming into contact with a solid surface, a very fine filament 50 μ long is extruded from the tip of the head. This reaction does not require the presence of eggs, egg water or of other adjuvant. 3. This filament is the first part of the spermatozoon to come into contact with the egg and activate it. It also plays an essential part in getting the spermatozoon into the egg cytoplasm. 4. There is no support for the view that the small cytoplasmic bleb which appears at the animal pole during the cortical reaction is a fertilization cone. The bleb appears after the entrance of a spermatozoon and no spermatozoon has been seen to pass through it into the egg. 5. This study substantiates an earlier suggestion by Ballowitz on the role of the head filament and shows that fertilization in the lamprey egg closely resembles those non-chordates which have an acrosomal reaction." @default.
- W2093796521 created "2016-06-24" @default.
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- W2093796521 date "1960-06-01" @default.
- W2093796521 modified "2023-09-23" @default.
- W2093796521 title "Fertilization of the lamprey egg" @default.
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- W2093796521 doi "https://doi.org/10.1016/0014-4827(60)90218-4" @default.
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