How can I create the descriptors below or above equation terms without displaying the actual underbrace or overbrace? enter image description here

  • Welcome to TeX SX! Could you post a full compilable code?
    – Bernard
    Sep 25 '18 at 23:35

Is it something like this you want?

 \documentclass[a4paper, 11pt]{book}



  U' = \underbracket[0pt]{k_1 U}_{\scriptsize\shortstack{uptake\\ of $U $}}
+\underbracket[0pt]{ k_4U(U_0-U)}_{\scriptsize\shortstack{$U$-dependent\\ biosynthesis of $U$}}
+\underbracket[0pt]{k_5\frac{p_1}{p_1 + U}}_{\scriptsize\shortstack{conversion\\ from $ E\to U $}}


enter image description here

  • Thank you kindly, it's exactly what I was looking for! :-)
    – user171165
    Sep 26 '18 at 0:41

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