 If you liked
Dogs: Bullets & Carnage
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 ...then you might like
Ilegenes: Kokuyou no Kiseki
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Both mangas deal with illegal genetic experiments on human beings and are set in cities characterized by corruption and violence. Also, two of the main characters are similar for some aspects: Haine and Fon are both cold guys, both have a similar dramatic past and both would like to take down an organization which deal with genetic experiment.
Moreover, both mangas are pretty dark and dramatic.