BIO 310 Lecture Notes - Lecture 12: Meristem, Embryonic Stem Cell, Hair Follicle
Document Summary
Stem cells - defined by their ability to self renew and differentiate into mature cell types. Vertebrate stem cells (skin, hair, follicles, intesting, germ cells, hematopoietic , heart, hippocampus, and muscle) Plant stem cells (shoot apical meristem, root apical meristem, floral meristem) Defined by cells that interact with them and its location. Simple niche - attached to a partner cell and the partner cell will give it signals about its current state. Complex niche - similar to simple nice, but the partner cells are more complex. Storage niche - physical storage compartment, but can provide signals to stem cells. Totipotent cells can turn into anything and keep dividing until they become a blastocyst. Blastocysts have undergone compacting dense ball of cells and cells on the outside. Cells on the outside become extraembryonic tissue (placenta) Clump of embryonic stem cells can be injected into a host blastocyst and will contribute to any tissue.
