Index: wp-includes/comment-template.php
===================================================================
--- wp-includes/comment-template.php	(revision 17521)
+++ wp-includes/comment-template.php	(working copy)
@@ -1057,7 +1057,7 @@
 	$link = '';
 
 	if ( get_option('comment_registration') && !$user_ID )
-		$link = '<a rel="nofollow" class="comment-reply-login" href="' . esc_url( wp_login_url( get_permalink() ) ) . '">' . $login_text . '</a>';
+		$link = '<a class="comment-reply-login" href="' . esc_url( wp_login_url( get_permalink() ) ) . '">' . $login_text . '</a>';
 	else
 		$link = "<a class='comment-reply-link' href='" . esc_url( add_query_arg( 'replytocom', $comment->comment_ID ) ) . "#" . $respond_id . "' onclick='return addComment.moveForm(\"$add_below-$comment->comment_ID\", \"$comment->comment_ID\", \"$respond_id\", \"$post->ID\")'>$reply_text</a>";
 	return apply_filters('comment_reply_link', $before . $link . $after, $args, $comment, $post);
@@ -1108,9 +1108,9 @@
 		return false;
 
 	if ( get_option('comment_registration') && !$user_ID ) {
-		$link = '<a rel="nofollow" href="' . wp_login_url( get_permalink() ) . '">' . $login_text . '</a>';
+		$link = '<a class="comment-reply-login" href="' . esc_url( wp_login_url( get_permalink() ) ) . '">' . $login_text . '</a>';
 	} else {
-		$link = "<a rel='nofollow' class='comment-reply-link' href='" . get_permalink($post->ID) . "#$respond_id' onclick='return addComment.moveForm(\"$add_below-$post->ID\", \"0\", \"$respond_id\", \"$post->ID\")'>$reply_text</a>";
+		$link = "<a class='comment-reply-link' href='" . get_permalink($post->ID) . "#$respond_id' onclick='return addComment.moveForm(\"$add_below-$post->ID\", \"0\", \"$respond_id\", \"$post->ID\")'>$reply_text</a>";
 	}
 	return apply_filters('post_comments_link', $before . $link . $after, $post);
 }
@@ -1141,7 +1141,7 @@
 
 	$style = isset($_GET['replytocom']) ? '' : ' style="display:none;"';
 	$link = esc_html( remove_query_arg('replytocom') ) . '#respond';
-	return apply_filters('cancel_comment_reply_link', '<a rel="nofollow" id="cancel-comment-reply-link" href="' . $link . '"' . $style . '>' . $text . '</a>', $link, $text);
+	return apply_filters('cancel_comment_reply_link', '<a id="cancel-comment-reply-link" href="' . $link . '"' . $style . '>' . $text . '</a>', $link, $text);
 }
 
 /**