CCR1 and retinal degeneration: Although this receptor is expressed by a wide range of immune cell types and plays a key role in recruiting monocytes (Trebst et al., 2002), our results provide the first evidence that CCR1 is also expressed in Müller cells, and this expression increases during acute retinal damage (e.g., following photic injury) and during progressive retinal degeneration (e.g., in the rd10 mouse).