Novel glucose transporter proteins, novel vesicular glutamate transporter
proteins and a novel potential-dependent K.sup.+ channel protein, are
useful as, for example, diagnostic markers, hyperlipemia,
arteriosclerosis, etc. These proteins, compounds promoting or inhibiting
the activities thereof, etc., which are obtained by a screening method
with the use of these proteins, and so on, are usable as safe drugs for
the prevention/treatment of the diseases above.
