3,3',5,5'-Tetramethylbenzidine GR
https://www.cellnucleus.org/shop/371-108622-33-55-tetramethylbenzidine-gr-12659
https://www.cellnucleus.org/web/image/product.template/12659/image_1920?unique=a46b659
This 3,3',5,5'-Tetramethylbenzidine is guaranteed a GR with the use of and directly supplied to your lab by Gentaur's warehouse.
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