[Histonet] symbols for antibody, antigen, biotin etc?

[Amy Lee]

Dear histonetters,
 
I am going to give a small lecture about IHC procedure. I need to make pictures including  antigen, primary antibody, secondary antibody, DAB, etc.. So I searched  for those icons (symbols) for these antibodies etc. but couldn't find ones I can use. 
 
Could anybody help me with this? Where I can find those symbols?
 
Thanks in advance!
 
Amy