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