The entirety of {HEAD ~ the body region} within {TAIL ~ the crystalline material} can be within a single crystal of the material 
within
The entirety of { HEAD ~ the body region } within { TAIL ~ the crystalline material } can be within a single crystal of the material
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH