Preferred Label : egg yolk;
Uberon definition : The yellow spheroidal mass of stored food that forms the inner portion of the egg
of a bird or reptile and is surrounded by the white.;
Uberon related term : yolk;
Uberon Function note : nutrient store;
Uberon Homology note : The majority of animals develop from a spherical egg with a single axis, the animal-vegetal
(an-veg) axis. The animal half of the egg usually contains the nucleus of the oocyte,
while the vegetal half of the egg is the preferred site for the storage of yolk. Eggs
with an-veg polarity are considered ancestral for the vertebrates. Frogs, for example,
have eggs with vegetally concentrated yolk and the nucleus located in the animal cytoplasm.[well
established][VHOG];
Origin ID : 0007378;
Currated CISMeF NLP mapping
- part of
The yellow spheroidal mass of stored food that forms the inner portion of the egg
of a bird or reptile and is surrounded by the white.
