*2.4.1 Cytotoxins*

This type of toxin is produced by some marine cyanobacteria species, and while it has no harmful effects on animals, it is poisonous to cells generated in cell cultures and inhibits the growth of a wide spectrum of microorganisms. Toxins such as these are examples (Tolytoxin, Tubericidin, Scytophycins and Actiphycins). Indolocarbazoles, tautazoles, microbilinisonitriles, and paracyclophares are more examples).

## *2.4.2 Biotoxins*

These compounds are made by cyanobacteria, which can have a variety of negative health consequences on humans and animals, and are frequently lethal. Toxins are categorized into three categories: neurotoxins, hepatotoxins, and endotoxins [7].
