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