FrameLabel that combines some text and some sub and superscripts [duplicate]

I need to add a FrameLabel that is "Mass lost, M_l [10^-3 kg]". I would like to have "l" as a subscript to M and "-3" as a superscript to 10.

• Look at Superscript and Subscript in the online help. – JimB Jan 27 '17 at 2:20
• You can type this in directly as a string with keyboard shortcuts. See this answer which shows how to do this. Use Ctrl+- to enter subscript and Ctrl+Space to exit it. – Edmund Jan 27 '17 at 3:46

"Mass Lost, \!$$\*SubscriptBox[\(M$$, $$I$$]\) \[\!$$\*SuperscriptBox[\(10$$, $$-3$$]\)kg]"

Row[{"Mass Lost, ", Subscript["M", "I"], "[", Superscript["10", "-3"],"kg]"}]