▁and ▁R P CH ▁is ▁so ▁significant ▁that ▁inject ing ▁insect s ▁with ▁R P CH ▁indu ces ▁an ▁A K H ▁like ▁response ▁and ▁vice ▁vers a ▁▁ ▁A K H ▁was ▁first ▁pur ified ▁by ▁an ▁English ▁group ▁in ▁ 1 9 7 6 ▁and ▁the ▁chemical ▁structure ▁was ▁determined ▁to ▁be ▁a ▁pe pt ide ▁h orm one ▁formed ▁from ▁ 1 0 ▁am ino ▁ac ids . ▁This ▁was ▁the ▁first ▁instance ▁where ▁an ▁insect ▁pe pt ide ▁h orm one ▁had ▁been ▁identified . ▁ ▁Later , ▁after ▁A K H ▁was ▁identified ▁in ▁co ck ro aches , ▁loc ust ▁A K H ▁was ▁inserted ▁into ▁a ▁co ck ro ach ▁and ▁a ▁similar ▁increase ▁in ▁li pid ▁mobil isation ▁was ▁observed . ▁Con vers ely , ▁co ck ro ach ▁A K H ▁led ▁to ▁similar ▁activity ▁within ▁a ▁loc ust . ▁ ▁A K H ▁has ▁become ▁an ▁important ▁area ▁of ▁study , ▁particularly ▁in ▁insect ▁c rop ▁p ests ▁and ▁insect s ▁that ▁act ▁as ▁intermediate ▁or ▁vector ▁hosts ▁for ▁par as ites ▁that ▁can ▁affect ▁humans ▁or ▁agricult ural ▁animals . ▁It ▁is ▁believed ▁that ▁A K H ▁does ▁not ▁only ▁aid ▁flight ▁in ▁insect s , ▁but ▁it ▁has ▁also ▁been ▁shown ▁that ▁an ▁increase ▁in ▁A K H ▁can ▁lead ▁to ▁stronger ▁imm une ▁responses ▁in ▁loc ust s . ▁One ▁group ▁have ▁performed ▁experiments ▁where ▁loc ust s ▁received ▁an ▁injection ▁including ▁A K H ▁and ▁li pop ol ys