The antitumoral potential of &amp;lt;em&amp;gt;Pllans-II, &amp;lt;/em&amp;gt;an acidic PLA&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; from &amp;lt;em&amp;gt;Porthidium lansbergii lansbergii&amp;lt;/em&amp;gt; snake venom on human cervical carcinoma cells.