analysis of the nucleoproteins extracted with salt and acid solutions in conjunction with bismuth staining after these treatments suggests that : ( 1 ) a bismuth amino group interaction occurs on ribonucleo-protein particles , histones and perhaps some non-histone chromosomal proteins , and ( 2 ) bismuth phosphate binding is specific for one , or all , of three distinct species of non-histone proteins .
C0028612
nucleoproteins
C0033684
proteins