Once you've selected your weapon, you should see gray circles. (twinfinite.net)
Co-expression of genes in the brain's prefrontal cortex when a human fetus is 10 to 19 weeks old in the womb, with high - confidence autism genes («seed genes») shown as black circles, probable autism genes as gray circles, and other highly co-expressed genes as white circles. (sciencedaily.com)
Orange circles indicate plots on terra firme; blue squares, plots on seasonally or permanently flooded terrain (várzea, igapó, swamps); yellow triangles, plots on white - sand podzols; gray circles, plots only used for tree density calculations. (science.sciencemag.org)