Hematopoiesis You just completed your screening of gene expr…

Hematopoiesis You just completed your screening of gene expression analysis comparing bone marrow from people who are over 110 years old versus a group with family histories of early death.  You discovered a new cytokine family member highly expressed in the long-lived group.  You have named the protein MPI (for “My Private Island”) and hypothesize that it helps stem cells function longer.  You have also confirmed that long-lived mouse strains also express MPI at higher levels in their bone marrow. (A)  Briefly describe how you could prove that MPI can expand the number of Hematopoietic Stem Cells quantitatively. (5 points) (B)  Briefly describe how you could distinguish between MPI expanding HSC numbers versus preventing HSC death. (5 points)