CCR1 and age-related macular degeneration: In line with this, in a smaller study (n = 9 AMD vs. n = 9 healthy controls) expression of other chemokine receptors involved in cell migration, CCR1 and CCR2 receptor expression on peripheral blood monocytes may be upregulated in late-stage nAMD (Anand et al., 2012), however this was not observed in a larger sample study (Krogh Nielsen et al., 2020).