The drain region, the source/base region, and {HEAD ~ the cathode region} have {TAIL ~ a second conductivity type} 
have
The drain region , the source / base region , and { HEAD ~ the cathode region } have { TAIL ~ a second conductivity type }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL