The article mentions the peptide "BNP", without explaining the abbreviation. This stimulated my curiosity.
It's "BRINP2-related peptide", where BRINP2 indicates a specific gene responsible for the production of the "BMP/retinoic acid-inducible neural-specific protein 2".
NCBI gene summary: "Predicted to be involved in cellular response to retinoic acid; negative regulation of mitotic cell cycle; and nervous system development. Predicted to be located in extracellular region. Predicted to be active in cytoplasm; dendrite; and neuronal cell body. Implicated in oral squamous cell carcinoma. [provided by Alliance of Genome Resources, Nov 2024]"