Lithotrophic iron-oxidizing bacteria produce organic stalks to control mineral growth: implications for biosignature formation Chan, Clara S. ; Fakra, Sirine C. ; Emerson, David ; Fleming, Emily J. ; Edwards, Katrina J. Abstract Publication: The ISME Journal Pub Date: April 2011 DOI: 10.1038/ismej.2010.173 Bibcode: 2011ISMEJ...5..717C