Stem cells function as ... stem cell behavior. In animals, the signaling molecules used within stem cell niches are often the same used to organize growth and tissue patterning during ...

Within multicellular organisms, tissues are organized communities of cells that work together to carry out a specific function. The exact role of a tissue in an organism depends on what types of ...

Down the hall, glass slides of gorilla, bonobo and elephant brain tissue, stained blue and brown, lie drying on tables and counters. From von Economo's work, Allman learned that the unusual cells ...