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Table 2 Grouping of the strains

From: Date of origin of the SARS coronavirus strains

Si

Sj

D(Si, Sj)

T0*(i, j)

Annotation

GZ01

BJ02

55

-172

Best Division

G1

GZ01

TOR2

53

-167

Best Division

G1

GZ01

US

56

-165

Best Division

G1

GZ01

SIN2500

53

-163

Best Division

G1

GZ01

BJ01

49

-153

Best Division

G1

BJ02

TOR2

24

-64

 

G1

BJ02

US

27

-61

 

G1

BJ02

SIN2500

24

-59

 

G1

BJ01

BJ02

16

-37

 

G1

BJ01

TOR2

14

-32

 

G1

BJ01

US

17

-30

 

G1

BJ01

SIN2500

14

-28

 

G1

TOR2

US

7

0

 

G2

SIN2500

TOR2

4

2

 

G2

SIN2500

US

7

5

 

G2

  1. Note: The best division is shown to the top, where one group include GZ01 and the other include the other strains. And from the time of the last common ancestor T0*(i, j), the strains can be classified into G1 = {GZ01,BJ01,BJ02} and G2 = {TOR2,US,SIN2500}.