The microscopic features included the chondroblast, osteoclast like giant cells, mitotic rate of less than 4 per high power field, islands of primitive chondroid and chicken wire calcification.
These genes were found in the chicken and primitive mammals, but not in placental mammals or in fish or amphibian species.
By comparing microarrays from microdissected primitive streak from single chicken embryos, we identified a large number of genes differentially expressed between male and female embryos at a very early stage (Hamburger and Hamilton stage 4), long before any sexual differentiation occurs.
S. O. Chicken wings are primitive.
After stage 4 HH, in the chicken embryo, the primitive streak begins to regress and after stage 13-14 HH, it becomes part of the tail-bud (Schoenwolf, 1979).
Chicken embryo transfection, primitive streak transplantation, time-lapse movie recording and tracking of paths of cell migration were performed as described previously (Yang et al., 2002).
As observed in the developing chicken lung, the primitive tubes at E8 are mainly lined by cuboidal epithelium, which converts to high columnar, then becomes stratified columnar with the onset of the first signs of attenuation.
Using the gene sequences that code for the visual protein rhodopsin in 30 living vertebrates, such as alligators, chickens, and more primitive vertebrates such as lampreys, the researchers reconstructed the rhodopsin belonging to the archosaurs.
The first comic is about a KFC-sponsored art therapy session where a bunch of kids with diseases are forced to play with primitive instruments in exchange for fried chicken.
Eating messy food like barbecued chicken really made her feel primitive, she said.
