Metals Ions in Bio-Imaging Techniques, Astrid Sigel, Eva Freisinger, Roland K. O. Sigel (Eds.). Vol. 22 of Metal Ions in Life Sciences, Walter de Gruyter, Berlin, Germany (2021). 503 + xliv pp., ISSN: 1559-0836; 1868-0402 (electronic). ISBN: 978-3-11-068556-5; 978-3-11-068570-1 (electronic PDF); 978-3-11-068578-7 (electronic EPUB). DOI: 10.1515/9783110685701