Update content/04.from-single-genes-to-gene-networks.md

Co-authored-by: Milton Pividori <miltondp@gmail.com>

content/04.from-single-genes-to-gene-networks.md

@@ -48,7 +48,7 @@ The model suggests that most genetic effects arise from these peripheral genes,
 [@doi:10.1016/j.cell.2018.05.051].
 Trans effects occur when a genetic variant at one locus affects the expression of genes at distant loci, often on different chromosomes.
 This contrasts with cis effects, where variants influence genes in their immediate vicinity.
-In this context, understanding *trans* effects is crucial for grasping the indirect influence of peripheral genes on core traits [@doi:10.20900/jpbs.20170014(S1-S8)].
+In this context, understanding *trans* effects is crucial for grasping the indirect influence of peripheral genes on core traits [@doi:10.20900/jpbs.20170014S2].
 
 However, the study of trans effects has inherent challenges.
 One of the primary limitations is their typically small effect sizes, which makes their detection difficult compared to cis effects.