The Poly-L-lysine solution is a liquid chemical that can be utilizd for the promotion of cell adhesion to solid substrates, conjugation to methotrexate for increased drug transport, microencapsulation of islets, cell microencapsulation technology, microarray glass slide coating, and chromosomal preparations. It is a positively charged amino acid polymer with approximately one HBr per lysine residue. This is sold in a quantity of 100 mL.