Lung surfactant protein D coiled-coil trimerisation <p>This domain is found in the SFTPD family, which includes lung surfactant protein D (SFTPD), conglutinin, collectin-43 and collectin-46. It forms a triple-helical parallel coiled coil, and mediates trimerisation of the protein [<cite idref="PUB00028933"/>]. </p>