10.1371/journal.pone.0190230.g001 Janne M. Schoening Janne M. Schoening Leigh A. L. Corner Leigh A. L. Corner Locksley L. McV. Messam Locksley L. McV. Messam Joseph P. Cassidy Joseph P. Cassidy Alan Wolfe Alan Wolfe Scoring categories used for assessing the number of silica-laden macrophages (SLMs) within badger tissues. Public Library of Science 2018 siliceous dust inhalation European badger mineral dust retention silica-laden macrophages Environmental dust inhalation Mycobacterium bovis infection status Chronic inhalation mineral dust particles 60 wild-caught badgers risk factor retrospective histological study extrathoracic lymph nodes SLM bovis infection status 2018-01-17 18:28:26 Figure https://plos.figshare.com/articles/figure/Scoring_categories_used_for_assessing_the_number_of_silica-laden_macrophages_SLMs_within_badger_tissues_/5795517 <p>Under polarized light, SLMs contrast brightly against the darker background tissue. For a higher magnification view of SLMs, see also Figs <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0190230#pone.0190230.g002" target="_blank">2</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0190230#pone.0190230.g003" target="_blank">3</a>.</p>