There are multiple definitions:
photoactive yellow protein(English)
- photosensory protein involved in negative phototaxis
- Photonics, Biology
- https://doi.org….1021/bi980504y
pyrophosphate(English)
- refers to scintigraphy
- ATTR, DPD, IVCCI
- Medical imaging, Cardiology
- https://doi.org…000000000005236