{HEAD ~ Dithiothreitol} is the most preferred reducing agent; preferred reducing agents are dithioerythritol and {TAIL ~ lipoic acid} 
{ HEAD ~ Dithiothreitol } is the most preferred reducing agent ; preferred reducing agents are dithioerythritol and { TAIL ~ lipoic acid }
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL