Table 1. Size-distribution of targeted and control contrast agent diameters (µm).

Contrast agent	Mean	Stdev	Mode	Median
SFRP2-targeted	3.6	1.4	4.0	3.8
anti-chicken IgY control	2.9	1.2	3.9	3.0
Streptavidin control	3.5	1.6	4.2	3.7