Hi karen,
We use Ventana's CD34 (QBEnd/10) Cat. # 760-2620 for our ES automated IHC 
stainer. It works great. We also use Dako'"s prediluted CD31 (JC/70A) Cat.# 
N1596, which needs pretreatment.

Good luck

Genia Perry AAS, BS, HT (ASCP)
Christiana Care Health System
Newark, De 19718