Typically, these two properties belong to {TAIL ~ different portions} of the labeling agent wherein {HEAD ~ the two portions} are chemically coupled together 
Typically , these two properties belong to { TAIL ~ different portions } of the labeling agent wherein { HEAD ~ the two portions } are chemically coupled together
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH