How to override node content in Drupal 7
In Drupal 7 the content is in $content.

See node.tpl.php

&lt;?php print render($content); ?&gt;


The $content definition:


  An array of node items. Use render($content) to print them all, or
  print a subset such as render($content['field_example']). Use
  hide($content['field_example']) to temporarily suppress the printing
  of a given element.