The phrase "are produced from a" is correct and usable in written English.
It can be used when describing the origin or source of something that is created or manufactured.
Example: "These chemicals are produced from a combination of natural resources and synthetic processes."
Alternatives: "are derived from a" or "are made from a".
Thus, many orders of roots of descending size are produced from a single prominent root, the taproot.
Tobacco production increased until about 1930, when most smokers in the United States shifted from cigars to cigarettes (which are produced from a different type of tobacco plant).
In 2002, Intel put the strategy into place at its plant in Rio Rancho, N.M., where chips are produced from a new generation of bigger silicon wafers; the company plans to do more exact copying in the future.
Instead, two genetically identical diploid egg cells are produced from a parent cell through mitosis (the process of cell duplication), and one or more of these daughter cells, which are both diploid and clones (that is, genetically identical) of the original parent cell, develop into a diploid offspring.
The canes are produced from a wood called rattan, which is a type of palm tree.
Although they are produced from a variety of sources, any fuel that finds its way into a plane is tightly controlled and regulated.
The data are produced from a model of an idealised resistivity change at a single site for a coal-seam gas pump into a shallow aquifer.
Italy has the highest number of honey varieties in Europe: 32 unifloral and different varieties of multifloral honeys are produced from a total of 1.070.262 hives [6].
Mature microRNAs (miRNAs), which act as recognition sequences for their target messenger RNAs, are produced from a molecular pathway which is different for plants and animals [1].
These models are produced from a set of measurements and the application of spatial interpolation techniques that provide an estimate at locations that lack dedicated measurements [5].
The decision tree proposed by Grana et al. [3] is also an unbalanced decision tree because they are produced from a pixel-based scan mask as shown in Figure 1.
