Ones from that would be "tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils." - https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwjAzoTz5sLT... ( Some extra info c: )