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8.B.21.1.9
Kappa conotoxin BTx or BeTx of 70 aas and 1 N-terminal TMS.  It is a modulator of potassium channels, specifically up-modulating the calcium and voltage-gated BK channels. It has no effect on single channel conductance, but increases the open probability of BK channels (Fan et al. 2003).

Accession Number:Q9U3Z3
Protein Name:Kappa-conotoxin BtX
Length:70
Molecular Weight:7900.00
Species:Conus betulinus (Beech cone) [89764]
Number of TMSs:1
Location1 / Topology2 / Orientation3: Secreted1
Substrate

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MMFRVTSVGC LLLVIVFLNL VVPTSACRAE GTYCENDSQC CLNECCWGGC GHPCRHPGKR 
61:	SKLQEFFRQR