http://en.m.wikipedia.org/wiki/Pericyte
http://www.ncbi.nlm.nih.gov/pubmedhealth/PMHT0022054/
http://www.bloodjournal.org/content/bloodjournal/75/11/2204.full.pdf?sso-checked=true
http://digitool.library.colostate.edu///exlibris/dtl/d3_1/apache_media/L2V4bGlicmlzL2R0bC9kM18xL2FwYWNoZV9tZWRpYS8xMjk3NTQ=.pdf
http://www.nature.com/nature/journal/v297/n5863/abs/297229a0.html
http://en.m.wikipedia.org/wiki/Basophil_activation
http://en.m.wikipedia.org/wiki/Basophil_granulocyte
http://en.m.wikipedia.org/wiki/Tryptophan
http://www.medicalnewstoday.com/articles/232248.php
http://www.merckmanuals.com/home/immune_disorders/biology_of_the_immune_system/innate_immunity.html