Despite the name, metaphyiscs isn't phyiscs. But perhaps what you're looking for is what's called the philosophy of science. You'll get a feeling for this if you study the early history of science. I recommend the recorded lectures of Dr. Lawrence Principe, produced by The Teaching Company. I have not yet started his series on the History of Science, but his set on Science and Religion was superb.
An antigen is a substance that produces an immune response in the body, typically by binding to specific antibodies or activating immune cells. This immune response is essential for recognizing and eliminating foreign substances such as pathogens.
it is antgens.
B lymphocytes.
specific immunity
B Cells mature in bone marrow and produce antibodies
B Cells
antibodies
lymphocytes
The opposite of malacia is
B-cells
The condition in which the body reacts to foods or substances is known as an allergy. Allergies occur when the immune system mistakenly identifies a normally harmless substance as a threat and produces antibodies to fight it, leading to symptoms such as hives, swelling, or difficulty breathing.
Antibodies