Choose the Correct Answer from the List Below

Choose the correct answer from the list below. Not all of the answers will be used.
-____________: A type of purification that is based on the attraction of the protein for a particular chemical group.

A) HPLC
B) specific activity
C) MALDI-TOF mass spectrum
D) gradient centrifugation
E) proteome
F) SDS
G) two-dimensional electrophoresis
H) Svedberg
I) immunoglobulin
J) differential centrifugation
K) overlap peptides
L) affinity chromatography