I believe the answer would be bone.
The immediate physical effects of abuse or neglect (bruises or cuts) can be relatively minor or severe (broken bones, bleeding or even death). In some cases the physical effects are temporary, but it is not necessary to reduce the pain and pain caused by a child.
If I were a doctor treating a patient with staphylococcus aureus i would prescribe penicillin because it controls bacterial growth. It also helps defend the body against dangerous diseases.
