APC fluorochrome

bmcbey@uoguelph.ca bmcbey at uoguelph.ca
Fri Jun 8 11:02:07 EDT 2007

I was wondering if anyone else has seen this problem.  I am using a  
FACSAria for analysis with  three fluorochromes.  I've been finding  
with my unstained sample that I regularly get a sharp peak in the APC  
channel which is unlike the broader peak I get for cells stained with  
the APC conjugated antibody.  I can get rid of this peak by re-running	
the sample after a period of 5 minutes or even if I put the sample on  
ice for a few minutes.	It's kind of disturbing.  Does anyone have a  
suggestion why this occurs?  I always run the cells through a cell  
sieve filter top tube bought from BD to prevent plugging of the  
machine.  Does this process non-specifically excite a cytoplasmic  
molecule which is read in the APC channel?  That's the only  
explanation I can come up with.
Betty-Anne McBey

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