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- Xantina Oxidasa 1
- Xenodiagnóstico 1
- Xilosa 1
- Yema de Huevo 2
- Yersinia pestis 1
- Yersinina Pestis 1
- Yodo 1
- Yogur 1
- Zarigüeyas 1
- ZIC2 1
- Zonas Remotas 1
- Zoonosis 20
- Zorros 1
- “Big Six” 1