TUBB2B and Duane retraction syndrome: We identified strong candidate variants in TUBA1A, TUBB6, TUBB4A, and TUBB, complementing our previous reports of tubulin-encoding TUBB3 and TUBB2B as oCCDD genes.1 We reported TUBA1A as a novel CFEOM gene during this study (pedigree 38)21 and subsequently identified an additional variant in syndromic sporadic DRS pedigree 170.