 We also work through an example , building an alignment and CM for the bacterial small RNA MicA, discovering a previously unreported family of divergent MicA homologs in  Xenorhabdus in the process . This chapter will provide readers with the background necessary to begin defining their own ncRNA families suitable for use in comparative, functional, and evolutionary studies of structured RNA elements .
<clarity>  We also work through an example , building an alignment and CM for the bacterial small RNA MicA, discovering a previously unreported family of divergent MicA homologs in  Xenorhabdus in the process . This chapter will provide readers with the background necessary to begin defining their own ncRNA families suitable for use in comparative, functional, and evolutionary studies of structured RNA elements .
 We also work through an example , building an alignment and CM for the bacterial small RNA MicA, discovering a previously unreported family of divergent MicA homologs in Xenorhabdus in the process .