Source and license notes supplied with these plates. Plate inclusion does not add a study to the review or change its evidence rating.

SOURCES — heterochromatin-aging-academic (Track 2, academic)

Every raster image used in this page's academic graphics, with its source, license and attribution. PDB coordinates are public domain per wwPDB policy (https://www.wwpdb.org/about/pdb-data-use); ribbons were rendered by the Hypothesis Critic team from those coordinates.

Images kept

File	What it shows	Source paper / authors	DOI / PMCID	Figure	License	Attribution line
`sahf-panelA.jpg`	Fig 2A crop: DAPI-stained human fibroblasts showing SAHF formation 2 weeks after 20 Gy IR (NT, H2A.J-KD, H2A.J-KI rows)	Abd Al-Razaq MA, Freyter BM, Isermann A, et al. “Role of Histone Variant H2A.J in Fine-Tuning Chromatin Organization for the Establishment of Ionizing Radiation-Induced Senescence.” Cells. 2023;12(6):916	doi:10.3390/cells12060916 · PMCID: PMC10047397	Fig 2A (cropped)	CC BY 4.0	Abd Al-Razaq MA et al., Cells 2023, Fig 2A, CC BY 4.0
`sahf-detail.jpg`	Magnified crop of the same panel: single nucleus with SAHF foci (derived, same license)	Derived from Abd Al-Razaq MA et al., Cells 2023, Fig 2A	doi:10.3390/cells12060916 · PMCID: PMC10047397	Fig 2A (magnified crop)	CC BY 4.0	Derived crop · Abd Al-Razaq MA et al., Cells 2023, CC BY 4.0

PDB structures rendered (public domain coordinates)

PDB	Structure	Rendered for
1KNA	HP1 chromodomain bound to H3K9-dimethylated histone tail	Molecular panels (reader + mark)
1AOI	Nucleosome core particle (histone octamer + DNA)	Molecular panels (nucleosome context)

Rejected candidates (not used)

Candidate	Why rejected
3J6R (HPV capsid, not this page)	n/a — listed here only to record the shared rejected-structure log for this batch
SAHF panel B (DNA-SCARS, 53BP1/PML) from the same paper	Shows DNA-damage foci, a related but different phenomenon; panel A (SAHF) covers the page topic directly