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. 2015 May 14;71(Pt 6):1295–1306. doi: 10.1107/S1399004715005817

Table 4. Iron–iron distances (Å).

Hb structure PDB code α1β1 α1β2 α1α2 β1β2
T state 2dn2/1hgb 36.4/36.1 24.3/24.4 34.1/34.4 39.5/39.7
R state 2dn1/3p5q 34.8/35.0 25.5/25.4 34.1/34.5 34.9/34.9
Human ζ2β2 S 3w4u 34.9 24.6 34.1 38.7
Cat α2β2 3gqp 34.4 24.4 32.7 38.6
IsdHN2N3–metHb 4xs0 34.5 24.7 33.9 38.3