The chemical reactions and pathways resulting in the formation of cutin, a waxy substance, which combined with cellulose forms a substance nearly impervious to water and constituting the cuticle in plants. [ISBN:0028623819]
The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane. [GOC:dos, GOC:go_curators]