Axial growth of hexactinellid spicules: Formation of cone-like structural units in the giant basal spicules of the hexactinellid Monorhaphis - X. Wang; A. Boreiko; U. Schloßmacher; D. Brandt; H. C. Schröder; J. Li; J. A. Kaandorp; H. Götz; H. Duschner; W. E. G. Müller (Journal of Structural Biology, 2008)