once selected,options of enviornment-dry/wet and cold/hot ,both will be presented, then there will be options-which chemical or cell to release, (plz know which chemical will do what it) options- The immune system involves cells from two major lineages including lymphoid cells derived from a lymphoid progenitor such as natural killer (NK) cells T-lymphocytes B-lymphocytes myeloid cells derived from a myeloid progenitor such as mast cells basophils neutrophils eosinophils monocytes macrophages