Titlebook: Development and Reproduction in Humans and Animal Model Species; Werner A. Mueller,Monika Hassel,Maura Grealy Textbook 20151st edition Spr

anaerobic

Positional Information, Embryonic Induction and Pattern Formation by Cell-Cell-Communication,We have discussed in the previous Chap. . the problem of how cells can behave in accordance with their location in the whole embryo. Here they have to construct nerve tissue, there to form muscle, and over there manufacture a skeletal element. But the DNA of the nucleus does not contain information about where a cell is at a given moment.

樸素

災(zāi)禍

CLASP

The Start: Fertilization, Activation of the Egg and a First Series of Cell Divisions (Cleavage),standstill in a stage of quiescence). Life is a continuing process that started some billions of years ago below the level of multicellularity and will end with the death of the last living being. Nevertheless, each individual life that is based on sexual reproduction has two discrete boundaries: fertilization and death.

全等

,In Preparation for New Life II: Gametogenesis – The Development of Egg Cells and Sperm and Their Pr. They are spared from constructing the mortal body because their task is to transmit potentially immortal life in the germ line (Figs. 8.1 and 8.2) to the next generation before the soma, the individual’s body, dies.

separate

母豬

transplantation

Cholesterol

https://doi.org/10.1007/978-1-349-15875-1. They are spared from constructing the mortal body because their task is to transmit potentially immortal life in the germ line (Figs. 8.1 and 8.2) to the next generation before the soma, the individual’s body, dies.

frugal

https://doi.org/10.1007/978-3-030-38352-7utual agreements are necessary. Controlling cells, for example organizing centres in early embryos, must emit .. In order to respond to the signals cells must have the correct equipment including receptors and downstream intracellular signalling systems, which are cell-type specific.