Certain types of nerve cells have the ability to regenerate a part of
the cell that has been amputated.  In an early study of this process,
measurements were made on the nerves in the spinal cord in rhesus
monkeys. Nerves emanating from the left side of the cord were cut,
while nerves from the right side were kept intact. During the
regeneration process, the content of creatine phosphate (CP) was
measured in the left and the right portion of the spinal cord. The
following table shows the data for the right (control) side (Y1), and
for the left (regenerating) side (Y2). The units of measurement are mg
CP per 100 gm tissue.