The antibody coated beads may be placed in a gradient fashion such that each layer binds to and selects a subset of {HEAD ~ cells} from {TAIL ~ the entire sample population} 
from
The antibody coated beads may be placed in a gradient fashion such that each layer binds to and selects a subset of { HEAD ~ cells } from { TAIL ~ the entire sample population }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL