I think it uses the_content. this is how my index.php looks like
<?php get_header(); ?>
<div id=”content”>
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<?php
## Exclude the ‘About’ category which is reserved for the footer
$excludeID = get_cat_id(‘about’);
if (in_category($excludeID)) continue; ?>
<div class=”post”>
<h1>” class=”articleTitle” rel=”bookmark” title=”Permanent Link to <?php the_title_attribute(); ?>”><?php the_title(); ?></h1>
<?php the_content(‘READ FULL ARTICLE ‘ . the_title(”, ”, false)); ?>
<div class=”postMeta”>
<?php include(“post-meta.php”); ?>
</div>
</div><!– end post –>
<?php endwhile; ?>
<?php else : ?>
<h2 class=”center”>Not Found</h2>
<p class=”center”>Sorry, but you are looking for something that isn’t here.</p>
<?php get_search_form(); ?>
<?php endif; ?>
</div><!– end content –>
<?php get_footer(); ?>