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Related Concept Videos

Spermatogenesis01:41

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...
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Updated: Jun 20, 2026

Effect of Male Accessory Gland Products on Egg Laying in Gastropod Molluscs
15:19

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Published on: June 22, 2014

Seminal Fluid Proteins as Regulation Factors for Optimizing Reproduction: A Modeling Approach.

Piotr Michalak1, David Duneau2, Jean-Baptiste Ferdy1

  • 1Université de Toulouse, Toulouse INP, CNRS, IRD, CRBE, Toulouse, France.

The American Naturalist
|June 18, 2026
PubMed
Summary
This summary is machine-generated.

Male seminal fluid proteins, like sex peptide (SP), synchronize reproduction and reduce unfertilized eggs. While potentially costly to females, these proteins enhance reproductive efficiency, benefiting both sexes.

Keywords:
Drosophilaovipositionproteinsseminal fluidsexual conflictsignals

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Last Updated: Jun 20, 2026

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Collection of Post-mating Semen from the Female Reproductive Tract and Measurement of Semen Liquefaction in Mice
12:06

Collection of Post-mating Semen from the Female Reproductive Tract and Measurement of Semen Liquefaction in Mice

Published on: November 18, 2017

Area of Science:

  • Evolutionary biology
  • Reproductive biology
  • Insect behavior

Background:

  • Male seminal fluid proteins influence female reproductive traits and behavior.
  • Sex peptide (SP) in *Drosophila melanogaster* affects egg production, oviposition, and remating.
  • SP is released post-mating, stimulating oviposition but potentially imposing survival costs on females.

Purpose of the Study:

  • To model how seminal fluid proteins synchronize sperm and egg release.
  • To investigate the role of SP exhaustion in reproductive synchronization.
  • To evaluate the net fitness effects of SP on female reproduction.

Main Methods:

  • Development of a biologically informed mathematical model.
  • Analysis of seminal fluid protein dynamics and sperm interaction.
  • Simulation of reproductive outcomes under varying SP levels.

Main Results:

  • Seminal fluid proteins can synchronize sperm and egg release, reducing unfertilized eggs.
  • Exhaustion of SP-like proteins, bound to sperm, acts as a key synchronization signal.
  • The benefits of synchronized reproduction likely outweigh potential costs to female survival.

Conclusions:

  • Seminal fluid proteins play a crucial role in optimizing reproductive efficiency.
  • Synchronization of gamete release via seminal fluid proteins is a potentially understudied reproductive feature.
  • SP-mediated reproductive regulation offers benefits that balance or exceed its costs to females.