Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Ex Input:
Context: We show that overexpression of Polo-like kinase 4 (Plk4) in human cells induces centrosome amplification through the simultaneous generation of multiple procentrioles adjoining each parental centriole. This provided an opportunity for dissecting centriole assembly and characterizing assembly intermediates. Critical components were identified and ordered into an assembly pathway through siRNA and localized through immunoelectron microscopy. Plk4, hSas-6, CPAP, Cep135, gamma-tubulin, and CP110 were required at different stages of procentriole formation and in association with different centriolar structures. Remarkably, hSas-6 associated only transiently with nascent procentrioles, whereas Cep135 and CPAP formed a core structure within the proximal lumen of both parental and nascent centrioles. Finally, CP110 was recruited early and then associated with the growing distal tips, indicating that centrioles elongate through insertion of alpha-/beta-tubulin underneath a CP110 cap. Collectively, these data afford a comprehensive view of the assembly pathway underlying centriole biogenesis in human cells.
Question: Where in the cell do we find the protein Cep135?

Ex Output:
centrosome

Ex Input:
Context: Edmund Crouchback (16 January 1245 -- 5 June 1296), a member of the House of Plantagenet, was the second surviving son of Henry III of England and Eleanor of Provence.
Question: What was the noble family that Edmund Crouchback was from?

Ex Output:
house of plantagenet

Ex Input:
Context: FictionBook is an open XML-based e-book format which originated and gained popularity in Russia.
Question: Which is the basis of FictionBook?

Ex Output:
xml