cell culture animal cells by Surachai Unchern

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.112.790&rep=rep1&type=pdf

animal cell culture basic by Freshney 20 pages

http://histologia.ugr.es/pdf/0471629359.pdf

biology important

http://biology.about.com/od/cellanatomy/p/nucleus.htm

cell biology

http://biology.tutorvista.com/animal-and-plant-cells/nucleus.html

biology

http://www.biologyexams4u.com/2012/06/nucleus-ultra-structure.html

genetics

http://www.geneticsalive.com/

cell cyle animaion

http://www.cellsalive.com/cell_cycle.htm