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. 2004 May 3;101(19):7246–7251. doi: 10.1073/pnas.0401429101

Table 3. GPCR disulfide bond conservation.

Receptors
C110—C187 disulfide bond
Classes Sequences % present % absent
A 1,972 92.4 7.6
B 163 97.6 2.4
C 75 91.5 8.5
D 24 87.5 12.5
E 5 100.0 0.0
Frizzled/smoothened 68 97.1 2.9
Putative 317 17.0 83.0
Orphans 338 41.4 58.6
Total 2,962 78.9 21.1