Cell Line, Tumor 6 Cell Proliferation 6 Humans 6 cell proliferation 6 controlled study 6 histamine H4 receptor 6 human 6 human cell 6 protein expression 6 1 (5 chloro 2 indolylcarbonyl) 4 methylpiperazine 4 1 [2 (amidinothio)ethyl]guanidine 4 Animals 4 Histamine 4 Male 4 Neovascularization, Pathologic 4 Proliferation 4 Receptors, G-Protein-Coupled 4 Receptors, Histamine 4 Signal Transduction 4 Western blotting 4 animal experiment 4 animal model 4 article 4 clobenpropit 4 cyclic AMP 4 histamine 4 histamine agonist 4 histamine receptor 4 in vitro study 4 in vivo study 4