{HEAD ~ Limited rotation}, micro lens scanning of DNA arrays, microscope slides, biological materials, etc., is performed by {TAIL ~ arcuate and translational motion} 
is performed by
{ HEAD ~ Limited rotation } , micro lens scanning of DNA arrays , microscope slides , biological materials , etc . , is performed by { TAIL ~ arcuate and translational motion }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL