Bones

Bone Ossification

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Diagram showing protein breakdown by the proteasome into peptides, their transport by TAP into the endoplasmic reticulum, loading onto MHC class I, and movement through the Golgi and secretory vesicles to the cell surface.
Adaptive Immune System

Antigen Processing and Presentation

by Antonia Round

Tissue Structure

Nerves

by Sam Barnes

Diagram contrasting extracellular and cytoplasmic compartments, showing potassium concentrations, charge distributions, and opposing diffusion and electrical gradients across a dashed boundary.
Synapses

Resting Membrane Potential

by Aleksandra Lasica and Matan Bone