9.B.293. The Prokaryotic Sybindin (Sybindin) Family This is a small family of proteins derived from uncultured archaea. Sybindin is a physiological syndecan-2 ligand on dendritic spines, the small protrusions on the surface of dendrites that receive the vast majority of excitatory synapses. The archaeal proteins may be related to the glycosyl transferases of family 9.B.142, subfamily 3.
Examples:
TC#	Name	Organismal Type	Example
9.B.293.1.1	Uncharacterized protein of 310 aas and 8 TMSs.		*UP of Lokiarchaeum* sp. GC14_75**

9.B.293.1.2	Uncharacterized protein of 417 aas and 9 TMSs.		*UP of Candidatus Heimdallarchaeota* archaeon LC_2 (marine sediment metagenome)**

9.B.293.1.3	Uncharacterized protein of 438 aas and 7 TMSs.		UP of the Crenarchaeota group, archaeon SMTZ-80