Among the less appealing case studies is one about a fungus that is wiping out entire populations of frogs and that can be halted by a rare microbial bacterium. Another is about squid that carry luminescent bacteria that protect them against predators.
I don't really understand this line, I wonder if among the less appealing case studies is the subject of the first sentence?
I may interpret it as Among the less appealing case studies, there's one about fungus.. I want to add a there there.
Can anyone tell me what structure the first sentence is and where the subject is.