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. 2018 Jul 4;11(3):65. doi: 10.3390/ph11030065

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Depiction of the chemical structures of bombesin (3) and [Lys⁴,Trp⁵,Nle⁷]BVD₁₅ (4) used as receptor blocking substances during the in vitro tumor cell uptake studies.