In normal cells APOBEC3 (A3A-A3H) enzymes as part of the innate immune system deaminate cytosine to uracil on single-stranded DNA (ssDNA) to scramble DNA in order to give protection against a range of exogenous retroviruses. DNA-based parasites. and endogenous retroelements. However. https://halohealthcarers.shop/product-category/stools-bath-chair/