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I also had to prepare agarose gels with EtBr in the past, but now there are several alternatives for gel staining, such as SYBR Green.

Which is able to stain because it intercalates into DNA. The same reason why etbr is seen as mutagenic by some.

Luckily I've been out of that particular game for a few years, but it's good to know that less questionable options are available