**2. Cell extrinsic effects of ecdysone on larval growth and body size**

The ecdysone pulse can act indirectly to affect larval growth as a consequence of the link between the ecdysone titre and developmental timing. Here we will discuss how cell extrinsic effects of the ecdysone pathway control *Drosophila* larval growth and final body size non-autonomously, at least in part, through interactions between the ecdysone and insulin pathways (King-Jones and Thummel 2005; Shingleton 2005; Mirth and Riddiford 2007; Nijhout 2008).
