A ƙarshen shekara ta 2005, an gano kwayoyin 25 da ke da alaƙa da asma a cikin mutane shida ko fiye, ciki har da GSTM1, IL10, CTLA-4, SPINK5, LTC4S, IL4R da ADAM33, da sauransu. Da yawa daga cikin waɗannan kwayoyin suna da alaƙa da tsarin rigakafi ko ƙyamar ƙonewa. Ko da a cikin wannan jerin kwayoyin da aka goyan bayan binciken da aka maimaita, sakamakon bai kasance daidai ba a cikin dukkan mutanen da aka gwada. A shekara ta 2006 an gano fiye da kwayoyin 100 da ke da alaƙa da asma a cikin nazarin kwayoyin halitta guda ɗaya; ana ci gaba da samun ƙarin.
sakamakon bai kasance daidai ba a tsakanin dukkan mutanen da aka gwada