+**Fa1** denotes a specific genetic locus or a primary factor in a sequence, often marking an initial state within [Biological Systems](/wiki/Biological_Systems). Its designation implies a fundamental role, critical for the progression of a [Process](/wiki/Process) or the definition of a specific trait.
+## See also
+- [Gene](/wiki/Gene)
+- [Locus](/wiki/Locus)
+- [Development](/wiki/Development)
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