Clinical Correlate

Primordial Germ Cells (PGCs) and Teratomas

Teratomas are tumors of disputed origin that often contain a variety of tissues, such as bone, hair, muscle, gut epithelia, and others. It is thought that these tumors arise from a pluripotent stem cell that can differentiate into any of the three germ layers or their derivatives.

Primordial Germ Cells Yolk Sac
Figure 1.1 An embryo at the end of the third week, showing the position of primordial germ cells in the wall of the yolk sac, close to the attachment of the future umbilical cord. From this location, these cells migrate to the developing gonad.

Some evidence suggests that PGCs that have strayed from their normal migratory paths could be responsible for some of these tumors. Another source is epiblast cells migrating through the primitive streak during gastrulation (see page 80).

Getting Back Into Shape After The Pregnancy

Getting Back Into Shape After The Pregnancy

Once your pregnancy is over and done with, your baby is happily in your arms, and youre headed back home from the hospital, youll begin to realize that things have only just begun. Over the next few days, weeks, and months, youre going to increasingly notice that your entire life has changed in more ways than you could ever imagine.

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