Basic Guidelines For English Spellings
READ THESE ARTICLES
noun
MedicineAn antigen to which the immune system has not previously been exposed, especially one that arises by alteration of host antigens by viral infection, neoplastic transformation, drug metabolism, etc.
Origin
1960s; earliest use found in Proceedings of the National Academy of Sciences of the United States of America.
Are You Learning English? Here Are Our Top English Tips
