ate ▁memory - like ▁functions ▁were ▁found . ▁In ▁in verte br ate ▁imm un ology ▁the ▁common ▁model ▁organ isms ▁are ▁different ▁species ▁of ▁insect . ▁The ▁experiments ▁foc using ▁on ▁imm une ▁prim ing ▁are ▁based ▁on ▁expos ing ▁the ▁insect ▁to ▁dead ▁or ▁sub le th al ▁do se ▁of ▁b acter ia ▁or ▁micro bes ▁to ▁el ic it ▁the ▁initial ▁inn ate ▁imm une ▁response . ▁After wards ▁the ▁research ers ▁compare ▁subsequent ▁in fe ctions ▁in ▁prim ed ▁and ▁non - prim ed ▁individuals ▁to ▁see ▁if ▁they ▁mount ▁a ▁stronger ▁or ▁modified ▁response . ▁ ▁Mechan ism ▁of ▁imm une ▁prim ing ▁ ▁It ▁seems ▁that ▁the ▁results ▁of ▁imm une ▁prim ing ▁research ▁are ▁showing ▁that ▁the ▁mechanism ▁diff ers ▁and ▁is ▁dependent ▁on ▁the ▁kind ▁of ▁insect ▁species ▁and ▁micro be ▁used ▁for ▁given ▁experiment . ▁That ▁could ▁be ▁due ▁to ▁host - path ogen ▁co e volution . ▁For ▁every ▁species ▁is ▁convenient ▁to ▁develop ▁a ▁special ised ▁defense ▁against ▁a ▁path ogen ▁( e . g . ▁b acter ial ▁stra in ) ▁that ▁it ▁enc oun ters ▁the ▁most . ▁In ▁ar th rop od ▁model , ▁the ▁red ▁fl our ▁be et le ▁Trib ol ium ▁cast ane um , ▁it ▁has ▁been ▁shown ▁that ▁the ▁route ▁of ▁in fection ▁( cut icular , ▁sept ic ▁or ▁or al ) ▁is ▁important ▁for ▁the ▁defence ▁mechanism ▁generation . ▁Inn ate ▁imm unity ▁in ▁insect ▁is ▁based ▁on ▁non - cell