The age-old question of the chicken or the egg is explored through evolutionary biology. Eggs, as membrane-bound containers for embryo development, predate chickens by millions of years. However, the ...

For hundreds of years, people have debated the classic question: did the chicken come first or the egg? It is a tricky puzzle because a chicken comes from an egg but eggs are laid by chickens. This ...

The fetal membranes consist of the chorion, amnion, yolk sac, and allantois. The chorion has three layers: cytotrophoblastic, chorionic connective tissue, and basement membrane. The chorion lies ...

aDepartment of Urology, University Hospital of the Santa Fe de Bogotá Foundation, Bogotá, Colombia bDepartment of Pathology, University Hospital of the Santa Fe de Bogotá Foundation, Bogotá, Colombia ...

Paternal obesity has been implicated in adult-onset metabolic disease in offspring. However, the molecular mechanisms driving these paternal effects and the developmental processes involved remain ...

The age-old debate of whether the chicken or the egg came first is explored through historical and evolutionary contexts. Eggs, appearing millions of years ago, predate chickens. However, the ...

Bird embryos don’t get oxygen directly from their mothers, but don’t worry. Life—and their eggs—find a way. Hard-shelled bird eggs contain albumen, or “egg white,” and a yolk. The fertilized egg cell, ...

ABSTRACT: Recently the fetal membranes are regarded to be abundant, ethically acceptable and easily accessible sources of mesenchymal stem cells, which cause only minor immunogenic troubles. In ...

Learn how to hatch chicken eggs with a light bulb in a homemade egg incubator with information on types of incubators, heat, humidity, ventilation, and hatching. Our start with chicken-raising was ...