In This Issue

AI Insight

This is a table of contents page from the Proceedings of the National Academy of Sciences (PNAS), Volume 123, Issue 21, published in May 2026. No actual research findings or scientific content are presented in this excerpt, as it only contains bibliographic information indicating it is an "In This Issue" section that typically lists articles contained within that journal issue.

Why it matters

Without access to the actual research articles or their descriptions from this issue, no specific practical implications or applications can be determined. This appears to be only a reference page rather than substantive scientific content.