of this low-density inner layer make up the cell wall's entire structure. Beneath the cell wall is the cell membrane, and beneath the cell membrane are thecal vesicles.

DNA in the cell exists in the form of chromatin coils tightly compacted together. It is condensed in the nucleus alongside an atypical histone complement. The DNA possesses ribosomal RNA (rRNA) that is folded and of similar morphology to rRNA in archaeobacteria. This indicates that RNA is important for DNA packaging in zooxanthellae. Zooxanthellae,