Figure 2: RT-PCR time course analysis of Hsp 21 (100 bp) expression in different tissues of white shrimp Litopenaeus vannamei at 0, 2, 4, 6, 8, 10, 12, 24, 36 and 48 h post injection of WSSV. Lane M- marker; Land 2 to 12 as 0, 2, 4, 6, 8, 10, 12, 24, 36 and 48 h. A. Hsp 21 expression in gill tissue B. Hsp 21 expression in muscle tissue C. Hsp 21 expression in hepatopancrease and D. Hsp 21 expression in pleopod.