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Beispielsweise bei mybiosource, abgerufen am 22. April 2016.
nih.gov
ncbi.nlm.nih.gov
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G. Ungar, C. Oceguera-Navarro: Transfer of habituation by material extracted from brain. In: Nature. Band 207, Nummer 994, Juli 1965, S. 301–302. PMID 5886227.
G. Ungar und M. Cohen: Induction of morphine tolerance by material extracted from brain of tolerant animals. In: International journal of neuropharmacology. Band 5, Nummer 2, März 1966, S. 183–192. PMID 5959957.
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Die Abbildung ist ein Nachdruck von Abbildung 2 in G. Ungar: Evidence for molecular coding of neural information aus dem Jahr 1973; einem Kapitel im Buch Memory and Transfer of Information.