“…One of the most well-studied polymorphisms is the ALAD2 allele, which results in reduced enzymatic activity compared to the more common ALAD1 allele. The ALAD2 allele has been associated with higher blood lead levels, suggesting that individuals carrying this variant may be more vulnerable to the toxic effects of lead exposure [9] , [11] , [26] . Our study reveled ALAD 1–2 genotype exhibited significantly longer tail lengths (mean difference = 20.4 µm, p < 0.001), higher tail intensities (mean difference = 15.2 arbitrary units, p < 0.001), and increased tail moments (mean difference = 3.8, p < 0.001).…”