Echinoderm sperm nuclei are unusual in that chromatin fibers are clearly seen, allowing their diameter to be accurately determined. Here, sperm from the starfish P. miniata were treated to remove the ...

Transmission electron micrograph of an unstained, unfixed cytochrome c oxidase crystal prepared from beef heart mitochondria imaged in the frozen hydrated state. A crystalline organization is seen wit...

Mucocysts have a herringbone pattern of subunits and are surrounded by a membrane that fuses with the plasma membrane. When the mucocyst content is extruded the content expands (see Hausmann, Protisto...

A view of the cortex showing early endosomes are often cup shaped and can have several coated evaginations arising from the rim of the cup. TEM taken on 8/10/65 by R. Allen with RCA EMU3F operating at...

Polykinetids of one membranelle of the buccal cavity, probably membranelle 1. Accessory microtubules arise from the row of basal bodies on one side. Parasomal sacs are not seen associated with this me...

Transmission electron micrograph of unstained cryo-section of a sperm cell of the starfish Patiria miniata. Echinoderm sperm nuclei are unusual in that chromatin fibers are clearly seen, allowing the...

A cross section near the proximal end of the cilium. Triangular densities link the doublets to the membrane. Bar = 0.2µm. TEM taken 7/23/65 by R. Allen with RCA EMU3F operating at 50kV. Adapted with ...

A view of the left side of the buccal cavity. It is covered by the plasma membrane, alveoli and a single partial layer of microtubules. Specialized cytoplasm lines the posterior end of this border. Or...

A cross section of cilium through the cilium-basal body complex extending from the cilium to the transition zone between the cilium and basal body and ending at the proximal tip of the basal body. Bar...

Transmission electron micrograph of unstained cryo-section of a sperm cell of the starfish Patiria miniata. Echinoderm sperm nuclei are unusual in that chromatin fibers are clearly seen, allowing the...