Tom,
If I recollect rightly, there are compounds that can be  incorporated into 
the membrane of living cells and used for tracking.   I have info on 2 products 
from SIGMA that may work for you.  They  are:
PKH26 Red Fluorescent Cell Linker kit for general membrane labeling  
(PKH26-GL)
PKH67 Green Fluorescent Cell Linker Kit for general membrane labeling  (Stock 
# PKH67-GL)
 
I have not used these products, so I can't speak to how well they work or  if 
they are fixable, but it may get you started....
Albert  

Albert C.  Grobe, PhD
International Heart Institute of Montana Foundation
Tissue  Engineering Lab, Saint Patrick Hospital

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