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Details of the cytoplasmic half of the transmembrane region in a view looking down the transmembrane helix of PLN. Only M4, M6, and M9 helices of SERCA (green) and PLN (yellow) are shown. Note that the transmembrane helices of SERCA do not run parallel to the PLN helix and that Leu-321 in SERCA appears to guide the path of PLN just above the membrane surface. A potential hydrogen bond between Asn-34 in PLN and Thr-805 in SERCA is indicated by a dashed line.
