| Title : Esterases in the early chick embryo - |
| Author(s) : Zacks SI |
| Ref : Anatomical Record , 118 :509 , 1954 |
| PubMedID: |
| Title : Histochemical localization of acetylcholinesterase in nervous tissue - |
| Author(s) : Ravin HA , Zacks SI , Seligman AM |
| Ref : Journal of Pharmacology & Experimental Therapeutics , 107 :37 , 1953 |
| PubMedID: |