Update cbass.md

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content/3.defense-systems/cbass.md

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 # CBASS
+## Description 
+
+The CBASS system stands for cyclic oligonucleotide-based antiphage signaling systems <a href=https://doi.org/10.1016/j.molcel.2021.10.020 a>. There are four types and multiple subtypes of characterized CBASS trans membrane systems. Activation of this system results in cell death to prevent phage replication. This system has a shared ancestry with the cGAS-STING innate immune pathway in animals <a href= https://doi.org/10.1038/s41564-020-0777-y> 
+## Molecular mechanism
+
+CBASS effector proteins limit phage propagation through membrane disruption. When CBASS is activated, Cap15 spreads throughout the cell and causes the inner membrane to rupture <a href=https://doi.org/10.1016/j.molcel.2021.10.020>
 ## Example of genomic structure
 
 A total of 4 subsystems have been described for the CBASS system.