{HEAD ~ Signal suppression} of {TAIL ~ lower abundance proteins} by high abundance proteins presents a significant challenge to SELDI mass spectrometry 
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{ HEAD ~ Signal suppression } of { TAIL ~ lower abundance proteins } by high abundance proteins presents a significant challenge to SELDI mass spectrometry
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH