STIL and microcephaly: Only a small set of conserved centriolar proteins is essential for centriole assembly (Brito et al., 2012; Gonczy, 2012) and some of these proteins, like CPAP and STIL, have been linked to microcephaly in humans (Leal et al., 2003; Bond et al., 2005; Gul et al., 2006; Thornton and Woods, 2009; Darvish et al., 2010).