In a common metaphor used to describe human fertilization, sperm cells are competitors racing to penetrate a passive egg. But as critics have noted, the description is also a 'fairy tale,' rooted in ...

A simplified model describing the mutual gamete activation during double fertilization in Arabidopsis. Before fertilization EC1 proteins accumulate in secretory vesicles of the egg cell (A). Likewise, ...

A new study identifies the defective function of CatSper, an ion channel controlling calcium levels in sperm, as a common cause of seemingly unexplained male infertility. CatSper-deficient human sperm ...

(A) Pollen grains generated from the stamen pollinate at the tip of the pistil. Pollen tubes grow inside the pistil towards the ovule located in the placenta. (B) The pollen tubes are guided to the ...

Fertilization Releases 'Zinc Spark' in Vertebrates Tessa Koumoundouros Science Alert July 19, 2021 Northwestern University ...