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#!/usr/bin/perl

...
it has a nucleus that contains genetic information.
<figr  n="2">Figure 2</figr>. The cell is covered by a 
membrane and is filled with a fluid.

Nerve cells come in many shapes and sizes,
but they all have a number of identifiable parts.
...
it has a nucleus that contains genetic information.
<FIGIND ID="FG.002" NUM="2">Figure 2</FIGIND>. The cell is covered by 
+a
membrane and is filled with a fluid.