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Table 3 Positive selection tests.

From: A new lysozyme from the eastern oyster, Crassostrea virginica, and a possible evolutionary pathway for i-type lysozymes in bivalves from host defense to digestion

Hypothesis

Change

Variation in ω

Background ω

Change ω

H0

None

none

0.111

n/a

H1

Episodic

branch a† only

0.110

0.293

H2

Episodic

branch b† only

0.110

undef (dN = 14.4, dS = 0)

H3*

shift

all in cv2C‡

0.090

0.154

H4*

shift

all in cv2C + branch b†

0.088

0.158

H5*

shift + episodic

all in cv2C, branch b† different

0.087

undef (dN = 14.1, dS = 0)

  1. * rate in test branch significantly different than background
  2. † Branches a and b refer to Fig 6.
  3. ‡ cv2C = boxed cv 2 Clade in Fig 6.
  4. Episodes or shifts in positive selection associated with the evolution of digestive function in bivalve i-lysozymes were tested.