Phenotypes Cannot be the Targets of a Production Arcs
In the SBGN export full_apoptosis.sbgn, it looks like phenotype "apoptosis" (node ID sa41) is the target of a production arc:
This is not possible via the SBGN PD rules (Section 3.4.1):
https://sbgn.github.io/downloads/specifications/pd_level1_version2.pdf
Perhaps a stimulation is meant?