The Caenorhabditis elegans pericentriolar material components SPD-2 and SPD-5 are monomeric in the cytoplasm before incorporation into the PCM matrix.
Wueseke O, Bunkenborg J, Hein MY, Zinke A, Viscardi V, Woodruff JB, Oegema K, Mann M, Andersen JS, Hyman AA. Mol Biol Cell. 2014 Oct 1; 25(19):2984-92. Epub 2014 Aug 7.