Euchromatin vs Heterochromatin – Chromatin Compaction Diagram for USMLE Step 1
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Euchromatin vs heterochromatin – one of the most tested distinctions in USMLE molecular biology, and one of the hardest to retain from text alone. This illustration shows the full DNA packaging pathway: double helix, nucleosome core (octamer: 2x H2A, H2B, H3, H4), H1 linker histone, histone acetylation, chromatin condensation stages, proposed 30-nm fiber, and condensed metaphase chromosome. Euchromatin – loosely packed, transcriptionally active. Heterochromatin – tightly condensed, transcriptionally silent. The distinction is made visually obvious rather than just labeled.
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