I'm new to English writing and, unfortunately, I cannot even find words to describe the problem properly (I guess there would be a special name for this issue). I wrote a sentence "[...] the assessment of alpha-diversity only requires the distinction between, but not the identification of species" but I am not sure whether this is clear and correct or it would be preferable to wrap the "what it is not"-part (I want to highlight what it is not about, however just slightly ;D) in em dashes. I'm also not sure about the necessity of the "but". But then, should lots of dashes even be used in scientific writing? So, what's the most appropriate version?
- [...] requires the distinction between, but not the identification of species
- [...] requires the distinction between—but not the identification of—species
- [...] requires the distinction between—not the identification of—species