title: How to make labels for a 2-D figure with Mathematica
body: <p>Goal: obtain the figure format like this one, Figure C in Fig.5.<a href="http://dna.caltech.edu/Papers/DNA_for_CRNs_2010_PNAS.pdf" rel="nofollow">enter link description here</a></p>
  
  <p>Assume: we draw Sin[x] with the range from 0 to 2Pi.</p>
  
  <pre><code>Plot[Sin[2 x], {x, 0, 2 Pi}, AxesLabel -&gt; {Style["time (hr)", 20], Style["Concentration (nM)", 20]},AxesStyle -&gt; Directive[Thick, FontSize -&gt; 15]]
  </code></pre>
  
  <p>Question: How to make labels for both x and y axes without adding annoying frames?</p>
  
  <p>What's more:</p>
  
  <pre><code>Plot[Sin[2 x], {x, 0, 2 Pi}, AxesLabel -&gt; {Style["hr", 20], Style["nM", 20]},AxesStyle -&gt; Directive[Thick, FontSize -&gt; 20]]
  </code></pre>
  
  <p>Codes like this couldn't obtain the similar format in A of Fig.6, especially for "hr" and "nM". </p>
  
  <p>Please do me a favour!</p>