The invention relates to genetic constructs encoding a compartmenting peptide, wherein expression of the compartmenting peptide leads to formation of a droplet body comprising a targeted biological product, and to vectors including such constructs. The invention also relates to methods of increasing the yield of a biological product in a plant, and to methods for producing a transgenic plant which produces an increased yield of a biological product. The invention also relates to transgenic plants, host cells, plant propagation products and plant parts. The invention also relates to the biological products themselves, produced according to the invention.