Why are Oryx and Crake banned?

Could you please elaborate on why Oryx and Crake, a novel by Margaret Atwood, has been banned in certain regions? Are there specific themes or content within the book that have sparked controversy or concern, prompting its prohibition? Are there differing opinions among readers and critics regarding its merits and potential harm? Understanding the motivations behind such a ban would help provide insight into the broader implications of censorship and the role of literature in shaping societal discourse.