In August, the National Science Foundation (NSF) Directorate for Biological Sciences (BIO) instituted new limits for proposal submissions–applicants could only be listed as PI or Co-PI on one proposal per year.
However, feedback from the community indicated that such limits may hinder collaboration as well as limit the number of early career investigators that may receive new awards. Thus, effective 15 November 2018, BIO has eliminated the proposal submission limits.
Additional details regarding the elimination of the limits may be found on the NSF BIO Directorate blog. Any references to the proposal limits for PIs/Co-PIs in the Fiscal Year 2019 BIO solicitations are no longer valid.