At this stage, the uninucleate microspore underwent an asymmetric mitotic division (microspore mitosis) to give rise to two cells, but the vegetative cell and the generative cell
was not observed.
The generative cell acquires a fusiform aspect with a lobulate outline (Fig.
The generative cell is surrounded by numerous vesicles with a fibrilar content of low electron density in contact with more and smaller vesicles (Fig.
A large animal preclinical model for the development of pluripotent or other high-risk/high-reward generative cell
therapies is absolutely required to address issues of tissue integration or homing, risk of tumor formation, and immunogenicity," Dunbar said.
Quinn has made ceramic pieces that represent reproduction in three organisms--the hydra, a single-cell organism that reproduces itself; the combination of prothallial cells, generative cell
, tube cell, and wings from the plant world; and the oviduct (or Fallopian tube) found in human beings.
But these are localized in the cytoplasm of both the vegetative and the generative cell (Franchi et al.
In early plastid exclusion, there is either a priori exclusion of plastids from the generative cell at the time of first haploid mitosis or a posteriori exclusion afterward (Pacini et al.
The generative cells are smaller and located at the base of the epithelium (Figure IB).
The generative cells, located at the base of the epithelium, exhibit large nucleus, an evident nucleolus, cytoplasm less electron-dense than that observed in absorptive cells with several mitochondria more electron-dense than that observed in absorptive cells (Figure 4C).
61 of 2003) essential for human reproduction oocyte developing human egg cell National Health Act (No.
At the cellular and genome level, he suggests a possible energetic role for "junk" DNA (that does not code for protein amino acid sequences), and he cites tissue regeneration studies in which weak electrical fields were used to de-differentiate generative cells
by unlocking repressed genes.
Male generative cells
appear to originate from choanocytes that migrate into the lumen of choanocyte chambers, where spermatogenesis takes place.