In a CLEC, {TAIL ~ the entire volume} of the luciferase CLEC would consist of {HEAD ~ light emitting enzyme} 
In a CLEC , { TAIL ~ the entire volume } of the luciferase CLEC would consist of { HEAD ~ light emitting enzyme }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD