Some vaccines are grown or developed using biological materials from animals or human cell lines. For example: • Gelatin (from pigs) is used as a stabilizer in some vaccines like MMR and varicella. • Egg (chicken embryo) protein residues can be present in some flu vaccines. • Human cell lines (like WI-38 or MRC-5), which originated from fetal tissue in the 1960s, are used to grow certain viruses for vaccines such as rubella or varicella. • Albumin from human plasma can be used as a stabilizer Se
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