Cellulose is also synthesized extracellularly by several bacterial species such as Gluconacetobacter,
Agrobacterium, Pseudomonas, Rhizobium, and Sarcin. In general, cellulose in BNC has the same chemical
composition as that from plants but it is produced in the absence of other polymers (such as hemicelluloses
or lignin) which makes it chemically pure.