Indicate true (T) and false (F) statements below regarding glycosaminoglycan chains in the extracellular matrix. Your answer would be a four-letter string composed of letters T and F only, e.g. TFTT.
( ) They are highly branched polysaccharides.
( ) They are strongly hydrophilic and absorb a large amount of water.
( ) They all contain N-acetylglucosamine or N-acetylgalactosamine.
( ) They are highly positively charged.