See 

Richard W. Burry
Specificity Controls for Immunocytochemical Methods
J. Histochem. Cytochem., Feb 2000; 48: 163 - 166. 

for a good discussion of controls in IHC. (And why peptide blocks aren't 
always what we think they are !)

Regards,
John
John Spaull
Target Discovery
GlaxoSmithKline R&D
Stevenage
01438 763296 ( fax 01438 764799 )
john.r.spaull@gsk.com 
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