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A BBB transporter for free choline has also been identified, which may function primarily to export choline from the brain [81]

Their small molecular size allows them to slip between cells in the stratum corneum, the outermost skin layer

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The further experiments showed that 1-N-naphthylphthalamic acid (NPA, a polar auxin transport inhibitor) inhibited the growth of primary root and reduced the density of lateral roots, whereas this negative effect of NPA was rescued by exogenous Ca 2+ and Glu, respectively (Singh and Chang, 2018), indicating that synergistic action of Ca 2+ , auxin, and Glu signaling in the structure of root architecture in Arabidopsis