Rheumatoid factor
Rheumatoid factor is an antibody with denatured IgG (an antibody) as an antigen caused by infectious factors (bacteria, viruses, etc.), so it is also called anti-antibody. Common rheumatoid factors are I gM type, IgG type IgA type and IgE type. Rheumatoid factors are common in the human body and play a certain physiological role.
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