sentence: One study reported the plasmid sequence of a Bacillus thuringiensis serovar israelensis ( Bti ) strain , and revealed that it may produce up to seven crystal-forming toxins , named Cry4A , Cry4B , Cry10A , Cry11A , Cyt1A , Cyt2Ba , and Cyt1Ca , which are all encoded by genes found in a single 127923 bp plasmid called pBtoxis .