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a thin, flexible layer of the plant cell wall inside the middle lamella. It consists mainly of cellulose, hemicellulose and pectin as well as cutin and wax where it forms the cuticle.
special chemical molecules that transmit nerve impulses across a synapse.
tissue that binds organ components and organs together and supports structures of the body.
a substance, usually a liquid, in which other substances can dissolve.
when humans construct or alter the genome of an organism.