{TAIL ~ The medium} may be used for serum free culture or supplemented with low levels of {HEAD ~ serum} 
{ TAIL ~ The medium } may be used for serum free culture or supplemented with low levels of { HEAD ~ serum }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD