A breakthrough in the study of polar auxin transport proved to be the results obtained through the use of molecular biology techniques - characteristics of the respective mutants , cloning of genes AUX1 and PIN , encoding putative auxin transport carriers that control dokomórkowy and extracellular transport of the hormone. Specific demonstrated by immunocytochemistry , polar location of these proteins in cells, stem and root of Arabidopsis thaliana.

Structure, properties and mechanism of action of the cryptochromes - The blue-light photoreceptors of Eukaryota.