under approximately physiological ionic conditions ( 0.1 m nacl ) addition of two hmg2 molecules per nucleosome , labeled by n- ( 3-pyrene ) maleimide at the sulfhydryl groups of cys-110 of histones h3 , resulted in a decrease of the pyrene excimer fluorescence corresponding to the slight movement of the sulfhydryl groups of the two histone h3 molecules apart .
C0028623
nucleosome
C0019647
histone h3