Fig. 1

Scanning electron microscopy (SEM) Bt strains Bt1, Bt9, Bt10, and Bt11 showing spore formation (S) and endo-crystals (C) are both typical characteristic features for Bt cells
Scanning electron microscopy (SEM) Bt strains Bt1, Bt9, Bt10, and Bt11 showing spore formation (S) and endo-crystals (C) are both typical characteristic features for Bt cells