Lorne - good stuff bro! I really enjoyed your STEM signs and the explanation for how you developed the concept, I especially like your sign for parasite.

Wanted to share some of what my own thought process looked like when developing ASL concepts to understand and discuss topics regarding bacteria. Maybe some of the signs will be a fit for you, or at least spark ideas for using a bacterial feature such as the peptidoglycan cell wall for an ASL sign.


Biology signs mentioned in this video:

Gram Negative Bacteria, Gram Positive Bacteria
Gram Positive Stain, Gram Negative Stain
Peptidoglycan
Lipopolysaccharide (LPS) / Endotoxin
Binary Fission

Bacterial culture - dividing into two every generation -
lag time, growth (log) phase, stationary phase, death phase

Cheers!