This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Hydroxyapatite crystal . Deposits of hydroxyapatite crystal light up bright green where they've been tagged with new peptide created at NIST to bond specifically to the compound The peptide has been linked to fluorescent stain for imaging Credit NIST Disclaimer Any mention of commercial products within NIST web pages is for information