Helena's experiments would be limited to Futanari participants, as she's not one herself. She'd be gathering samples, doing physical exams, genetic exams, etc. But, she wouldn't really need non-futanari participants.<br/><br/>Although, I could see Reyna asking Helena if she needed an assistant to collect samples or the like. Something allowing Reyna to get a bit hands on with some of the Futanari. Yes, I could see that happening.