Deep Tree: Students explore an interactive tree of life and trace the shared ancestry ... in a teaching unit over the course of several class sessions. Teachers should allot about 3 hours to ...

How far do we go to define the tree of life — does it start only from the ... Viral inhibition of MHC class II antigen presentation. Trends Immunol. 24, 278–285 (2003). N.R.H. is supported ...