Negatively stained mycobacterial phage 607 / mc-1 prepard from lysogenic strain of Mycobacterium smegmatis 607. Mycolic acids are responsible for acid-fast reaction, the most distinctive property of the genus. Nonpathogenic M. smegmatis is associated with a thick, cheesy, odoriferous sercretion found under the labia minora about the glans clitoridis and under the male prepuce from Tyson's glands. TEM Magnification = x19,000 at 70mm