Table 1. Ratio of Radioactivity Accumulation in the Gray Matter of Aβ(+)/tau(+) against Aβ(+)/tau(−) Brain Sections.

compound	Aβ(+)/tau(+)/Aβ(+)/tau(−) ratio
[125I]27 ([125I]BIPM-NHMe)	3.4
[125I]28 ([125I]BIPM-NHEt)	2.8
[125I]29 ([125I]BIPM-NHPr)	1.2
[125I]39 ([125I]BIPM-NEt2)	1.6
[125I]BIPM-NMe2a	6.2
[125I]30 ([125I]PIP-NHMe)	8.2
[125I]31 ([125I]PIP-NHEt)	5.6
[125I]32 ([125I]PIP-NHPr)	1.3
[125I]40 ([125I]PIP-NEt2)	0.7
[125I]PIP-NMe2a	3.2

^aThe data were reported previously.¹⁷