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Peter Flohr
Peter Flohr • 1 year ago

Image: The embryo of Echinaster brasiliensis (a starfish) is imaged with darkfield microscopy (60x maginfication) at the 2-cell and 4-cell stages (top). The cells divide asymmetrically to form the morula (bottom left) and then differentiate into a swimming larva after gastrulation (bottom right).

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Cell Division, Mitosis, & Meiosis.

Here the early blastula of the sand dollar (Dendraster excentricus) is imaged with laser scanning confocal microscope (Olympus FluoView FV1000). Antibody to tubulin labels mitotic spindles, and the false-coloring scheme mitigates the dramatic intensity difference between the bright, dense microtubule bundles of the spindle itself and the comparatively insubstantial astral microtubules radiating in all directions toward the cortex from each spindle pole.

The seminferous tubule also contains Sertoli cells (green) embedded between the differentiating sperm cells (red). Sertoli cells nurture the developing sperm cells by secreting hormones and proteins required for spermatogenesis. Sertoli cells also establish and maintain the stem cell niche to ensure renewal of sperm cell precursors.

Starfish embryo, Dr. Alvaro Migotto from the University of Sao Paulo, Brazil