{TAIL ~ R5}, R6, {HEAD ~ m}, and n are independent in each of the ##STR38## subunits when p=2; or d.) 
{ TAIL ~ R5 } , R6 , { HEAD ~ m } , and n are independent in each of the # # STR38 # # subunits when p=2 ; or d. )
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH