Except CRISPR, what can the plasmid carry out as an immunity against phage??
Normally it is the palindromic repeats which gives the polymorphic immunity, but of course its distribution with the spacers is equally important too.
see this article, I hope helpfull:
Article Dynamics of adaptive immunity against phage in bacterial populations
See these articles, it would help hopefully:
https://www.frontiersin.org/articles/10.3389/fmicb.2016.01292/full
http://johnsonlab.med.harvard.edu/Micro201/Nat%20Rev%20Microbiol%202010%20Labrie.pdf
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