A biochip, {HEAD ~ a platform} which composes the biochip, and a stage which composes {TAIL ~ the platform} 
A biochip , { HEAD ~ a platform } which composes the biochip , and a stage which composes { TAIL ~ the platform }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL