solution electropsis gel stain solution electropsis gel stain coomie brilliant blue g 250 protein solution electropsis gel stain coomie brilliant blue staining coomie brilliant blue stain protocol coomie brilliant blue staining of protein staining methods an overview g250 or r250 coomie dyes coomie brilliant blue staining of coomie blue r 250 staining solution coomie brilliant blue r 250