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Credit: Salk Institute, La Jolla. Source: Wellcome Collection.
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![Gruol/Siggins Henrickson will add problems and iontophoresis Sensitivity to putative neurotransmitters at known concentration in vivo - unknown in vitro - limited information available since perfusion not commonly used peptides - 10- 8 to 10- 5 M (or opiates) typically yM Catecholamines - 10- 6 to 10- 3 M Amino acids - ]iM](https://iiif.wellcomecollection.org/image/b18175399_PP_CRI_E_1_29_4_0011.jp2/full/800%2C/0/default.jpg)
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