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(a) Relationship between the effective number of codons (N c) and GC content of the third codon position (GC3) of three different genes (≥80 codons long) in 147 begomoviruses. The continuous curves represent the expected curve between GC3 content and N c under random codon usage; (b) Relationship between the GC content at the first (GC1)/the second (GC2) codon position and that at the third codon position (GC3) of AV1, AC1 and AC4 genes (≥80 codons long) in 147 begomoviruses
