Tutorial: Allen Spinal Cord Atlas

Picked one by one from a mixed channel. Transcript check: both title readers certain; 5 of 5 sampled certain picks confirmed by transcript, none failed. Channel rule: Include only the numbered lecture series, research talks by named scientists at symposia/showcases, and technique or tool demonstrations and tutorials (e.g., patch clamp, electron microscopy tour, Exa-SPIM, atlas tutorials); exclude promos, launch/announcement events, brand pieces, vendor/sponsor talks, social-media sessions and Lab Notes episodes.