aminoacids animals biologicaltransport blood-brain-barrier blood-brainbarrierdisorders blood-vessels bloodcells bloodsupply blut-hirn-schranke brain braindiseases centralnervoussystemagents centralnervoussystemdiseases cerebrospinalfluid choroidplexus clinicalprotocols congresses control diseases drug-relatedsideeffectsandadversereactions drugdeliverysystems drugdesign drugdevelopment drugdiscovery drugeffects drugtargeting drugtherapy effectofdrugson endothelialcells health/fitness immunology internalmedicine laboratorymanuals mammals medical medical-immunology medical-neuroscience metabolism methods microcirculation molecularbiology moleculardiagnostictechniques nanocapsules nature neurons neuropharmacology neurophysiology neuroscience neurosciences pathology peptides pets pharmacokinetics pharmacology physiology physiopathology prevention rm315 therapeuticuse tryptophan tryptophanmetabolism wl200 wl200b65472003 wl200s454b1990 wl203d267p1987