Embryonic stage

The blastocyst is an early embryonic stage in mammalian development. Murine blastocysts can be harvested at day 3.5 p.c. Their inner cell mass contains embryonic stem cells. Multiple murine embryonic stem cell lines have been established. Embryonic stem cells carrying genetically engineered mutations are injected into blastocysts, which are subsequently implanted into pseudopregnant foster mothers. 

Fig. 4.2 Differentiation from olfactory placode of main and VN primordia (a) to (b), embryonic stages in reptiles (Squamates and Crocodylia). (a), Early invagination of placode (a ), late separation of primordia for AOS/MOS and (b), agenesis of presumptive VN(JO) cells in crocodile (NPT, nasal pit) (from Parsons, 1970).

Fig. 4.2 (c) to (d), Early and late embryonic stages in mammals, invagination and separation of AOS from MOS (from Farbmann, 1992). 

Fig. 10.1. Localization of Acanthocheilonema viteae chitinase in intrauterine and newborn mf by IFAT with mAb 24-4 (left panels) and corresponding light microscope photographs (right panels). (A), (B) Uterine contents of female A. viteae with nearly mature mf inside the eggshell, younger embryonic stages and a mature, hatched mf. (C), (D) Newborn mf. Note that fluorescent mf are swollen and stumpy. Bars represent 50 pm es, embryonic stages nmf, nearly mature mf hmf, hatched mf.

When the nature of the disorder is spatially invariant EXAFS is a viable technique. Under these circumstances, however, unless the specimens are exceptionally thin (<20 ), HREM is of little value (13, 14), as two-dimensional projected images are difficult to interpret. When, however, there are residual crystalline regions still intact in a growing glassy matrix, or when, conversely, the embryonic stages of crystallization of a glassy precursor have been reached, HREM is particularly powerful (14, 15). 

Rodent NSCs from embryonic stages form neurospheres in about 2-3 days, whereas NSCs from postnatal stages require 5-7 days to give rise to neurosphere. 

Serotonin 5-HT 2B receptor HTR2B Agonism Cardiac valvulopathy, fibroblast mitogenesis, hypertension. Antagonism No side effects clearly defined, but cardiac effects cannot be excluded, especially at embryonic stage. 

Dahm R (2002) Atlas of embryonic stages of development in the zebrafish. In Nusslein-Volhard C, Dahm R (eds) Zebrafish a practical approach. Oxford University Press, New York, NY, pp 59-94... 

Schneider I (1972), Cell lines derived from late embryonic stages of Drosophila melanogaster,]. Embryol. Exp. Morphol. 27 353-365. 

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