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Table 2 Differences in the frequencies of functional OR genes among different species

From: Analysis of cattle olfactory subgenome: the first detail study on the characteristics of the complete olfactory receptor repertoire of a ruminant

Species No. of functional genes (%) No. of pseudogenes
Pig 1,113 (86) 188
Cattle 881 (82) 190
Rat 1,201 (80) 292
Dog 872 (80) 222
Mouse 1,037 (75) 354
Zebrafish 102 (74) 35
Human 388 (48) 414
Frog 410 (46) 478
Pufferfish 44 (45) 54
Chicken 82 (15) 476
  1. Note: Except for cattle, data were from Niimura and Nei [22] and Nguyen et al. [6].