Native heparin is a polymer with a molecular weight ranging from 3 to 30 kDa, although the average molecular weight of most commercial heparin preparations is in the range of 12 to 15 kDa.
A heparina nativa é un polímero cun peso molecular de 3 a 30 kDa, pero o peso molecular medio dos preparados de heparina comerciais é de 12 kDa a 15 kDa.