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Table 1 Model Parameter Estimates, dN/dS Ratios, Log Likelihood Values and Test Statistics for PAML Site Models.

From: Evidence of positive selection at codon sites localized in extracellular domains of mammalian CC motif chemokine receptor proteins

Gene Model Parameters dN/dS p l 2Δl
CCR2 M7: Neutral, beta p = 0.33949, q = 1.05276 0.2417 2 -4931.71  
  M8: Selection, beta + ω p0 = 0.97570, p = 0.45144 0.2728 4 -4924.10 M7 vs. M8: 15.22***
   q = 1.67059, (p1 = 0.02430)     
   ω = 2.83526     
CCR3 M1a: Nearly Neutral ω0 = 0.07487, ω1 = 1.00 0.4314 2 -5536.21  
   p0 = 0.61460, (p1 = 0.38540)     
  M2a: Selection ω0 = 0.07422, ω1 = 1.00 0.5014 4 -5526.29 M1a vs. M2a: 19.84***
   ω2 = 5.44115, p0 = 0.60315     
   p1 = 0.38339, (p2 = 0.01346)     
CCR3 M7: Neutral, beta p = 0.22415, q = 0.35810 0.3850 2 -5534.05  
  M8: Selection, beta + ω p0 = 0.98363, p = 0.23871 0.2662 4 -5522.90 M7 vs. M8: 22.30***
   q = 0.3298, (p1 = 0.01637)     
   ω = 4.50735     
  1. The test statistic 2Δl is compared to a χ2 distribution with 2 degrees of freedom, critical values 5.99, 9.21, and 13.82 at 5%, 1%, and 0.1% significance, respectively. Significant results are indicated by asterisks. Values for non-significant comparisons are presented in Additional File 1.