<p>The new series &quot;Microbiology Monographs&quot; begins with two volumes on intracellular components in prokaryotes. In this second volume, &quot;Complex Intracellular Structures in Prokaryotes&quot;, the components, labeled complex intracellular structures, encompass a multitude of important cellular functions. Continuing and newly initiated research will provide a clearer understanding of the complex intracellular structures known at present and will bring to light surprising new ones as well.</p>