part of preceded by simultaneous with developmentally preceded by relation between physical entity and a process or stage existence starts during or after The relations here were created based on work originally by Fabian Neuhaus and David Osumi-Sutherland. The work has not yet been vetted and errors in definitions may have occurred during transcription. x existence starts during or after y if and only if the time point at which x starts is after or equivalent to the time point at which y starts. Formally: x existence starts during or after y iff α (x) >= α (y). existence starts at end of Christopher J. Mungall