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