Anti-Shal and anti-Shaker specifically recognize their respective proteins. Western blots containing protein extracts from the lobster nervous system (NS) and tail muscle (M) were probed with anti-Shal (A) or anti-Shaker (B) antibody. The molecular weight standards for each Western blot are indicated. Western blots containing in the 16.7 kDa pinpoint-Shaker (K) and the 15.2 kDa pinpoint-Shal (L) fusion proteins were probed with anti-Shal (C) and anti-Shaker (D) antibodies. The arrows point to the position of the 28 kDa GST protein.