Create a scientific figure about: Neuron synapse ultrastructure with vesicles and postsynaptic density.
Visual style: Soft Biomedical.
Requirements:
- publication-ready scientific quality
- clear labels and directional arrows where appropriate
- avoid cartoon style, avoid meme style, avoid stock-photo look
- avoid neon glow and over-sharpened CGI look unless explicitly requested
- composition optimized for research papers and academic slides
- category context: micro-structures
- subtle soft-shaded biomedical rendering without cartoon style
- clean depth cues and organelle/material differentiation
- balanced pastel-accent palette while retaining scientific rigor
