When a bioreactor is to be inoculated, {HEAD ~ the contents} of the bag are drained via {TAIL ~ a sterile weldable inoculation line} 
are drained via
When a bioreactor is to be inoculated , { HEAD ~ the contents } of the bag are drained via { TAIL ~ a sterile weldable inoculation line }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL