The reference to resemblance brought a pink tinge to Nigredo's cheeks, and the child briefly glanced to the side, as though embarrassed. It was an odd development. He never held an ounce of unease for being a practical clone of his brothers, only exasperation at never escaping the association. Fortunately, the color vanished almost immediately, leaving Nigredo to address the subsequent comments.

"Oh, that makes sense." An act of deduction as opposed to outright tells--it was at least better than other scenarios. Although, now there was a term he was entirely unfamiliar with. "Cyber-Elf?" he echoed, giving a contemplative tilt of the head. A kind of human/humanoid, perhaps, given the initial hypothesis. He was curious, but another subject needed addressing first.

"Er, though, I can answer any questions you have about retroviruses," continued Nigredo. "How much did Albedo tell you?"