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9.B.444.  The Uncharacterized YjeO/YgiZ (YjeO/YgiZ) Family 

These two proteins (YjeO and YgiZ) are members of the YjeO family as well as the DUF2645 family.  They are small (~ 100 - 110 aa) proteins with 3 TMSs in a 1 + 2 TMS arrangement. The ygiZ gene is induced upon exposure of E. coli to external Ca2+ (Zhu et al. 2022).

References associated with 9.B.444 family:

Zhu, N., S. Sun, F. Leng, W. Fan, J. Chen, J. Ma, H. He, G. Yang, and Y. Wang. (2022). Identification of Key Genes during Ca-Induced Genetic Transformation in by Combining Multi-Omics and Gene Knockout Techniques. Appl. Environ. Microbiol. 88: e0058722. 36255244