NK cell responses in tissues.

<p>The frequency of total NK cells in PBMCs, lymph nodes (LN) and gut-associated lymphoid tissues (GALT) (A), and of CD16<sup>+</sup>, CD56<sup>+</sup> and CD16<sup>-</sup>CD56<sup>-</sup> NK cells in LN (B) and GALT (C) during acute (week 2) and chronic (week 8) infection were compared to the frequency of these populations prior to SIV infection (week -4). Significant differences are indicated with asterisks (p<0.05*, p<0.01**, p< 0.005*** & p<0.001****, Mann-Whitney <i>U</i>-test).</p>