ribonukleoproteiinne osake, mis seostub vastsünteesitud polüpeptiidahela tsütoplasmavõrgustikku suunamise signaaljärjestusele, The signal recognition particle (SRP) is an abundant, cytosolic, universally conserved ribonucleoprotein (protein-RNA complex) that recognizes and targets specific proteins to the endoplasmic reticulum in eukaryotes and the plasma membrane in prokaryotes.