Before April 16, 2014, NIH permitted one resubmission (A1) of an unfunded application (see NOT-OD-09-016). The extension on the NIH grant number could follow the pattern (A0, A1). A first-time submission is informally referred to as an A0, and the first resubmission is known as an A1. Any virtual A2s would be flagged by the NIH Center for Scientific Review.

For all application due dates after April 16, 2014, following an unsuccessful resubmission (A1) application, applicants may submit the same idea as a new (A0) application for the next appropriate new application due date (see NOT-OD-14-074).

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