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(Received for publication, July 27, 1994; and in revised form, October 18,
1994) Calcium entry, via a dihydropyridine-sensitive pathway, is
required for differentiation in murine erythroleukemia cells (MELC).
Calcium channel currents have been identified physiologically in some
non-excitable cells, but little is known regarding the structure of
these channels. We show that a truncated form of the
Volume 270,
Number 1,
Issue of January 6, 1995 pp. 483-493
©1995 by The American Society for Biochemistry and Molecular Biology, Inc.
subunit of the cardiac voltage-gated calcium channel
(dihydropyridine receptor, DHPR) is expressed in MELC. This MELC
calcium channel lacks the first four transmembrane segments of the DHPR
(IS1 to IS4). A MELC calcium channel/cardiac DHPR chimera, co-expressed
with the 
and 
subunits of the DHPR, forms a
functional calcium channel in Xenopus oocytes.
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