Summary
Microtubular structures, apparently continuous with the plasmalemma, have been observed in thin sections of two strains of group D streptococcal L-forms. The tubules had an external diameter of about 250 Å and a hollow core 100–150 Å in diameter. The tubules were found protruding either into or out of the L-form cells and were only found in cultures growing in the presence of penicillin.
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Corfield, P.S., Smith, D.G. Microtubular structures in group D streptococcal L-forms. Archiv. Mikrobiol. 63, 356–361 (1968). https://doi.org/10.1007/BF00412121
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DOI: https://doi.org/10.1007/BF00412121