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In biological systems, some amino acids are more soluble in water due to the hydrophilic regions.
Based on the structures of the amino acids pictured, which of the following would be the LEAST soluble in water?
By Vaccinationist (Own work) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons
By Ben Mills (Own work) [Public domain], via Wikimedia Commons
By NEUROtiker (Own work) [Public domain], via Wikimedia Commons