In the scientific literature there have been around 400 reports of possible precursors, of roughly twenty different types.

He is now considered a possible precursor to the views usually associated with William of Ockham.

The test was chemical, a possible precursor to a treatment for Orkett's disease.

- Predetection images: they set up upper limits for any possible precursors.

One study by Butler in 1965 proposed possible precursors to this natural product.

Catherine's mole turned out to be abnormal, and a possible precursor to melanoma.

Cholesterol levels that are high are possible precursors to heart disease.

Such a gain would normally raise red flags as a possible precursor of inflationary pressures.

This could be viewed as a possible precursor for genocide.

The following factors lead the group to recognize this as a possible precursor to an earthquake: