Detailed Instructions: In this task, you are given a sentence. You are expected to write the name of the organism substances in the body mentioned in the input. Although there might be several correct answers, you need to write one of them.
Q: The proteins responsible for a majority of the higher binding were identified as immunoglobulins , based on their elution from gel filtration columns and the removal of 57 - 88 % of the non - albumin binding by treating of plasma with Protein A - agarose .
A:
plasma