Table 1.

Number of β-arrestins 1 and 2 partners retrieved from manual curation of the literature and by queries in publicly available databases.

Querya	β-Arrestin 1	β-Arrestin 2
Xiao et al. (13)	158	244
NetPath	21	27
BioGRID	40	27
Mentha	10	7
HIPPIE	4	30
Manual curation	49	39
Total	282	374

^aIn each subsequent source, the additional interactions found with respect to the previous one were sequentially added.