Immunohistochemical detection of thymosin β₄ in salivary glands at 13 weeks (91 days) of gestational age.

<p>a) (400×) abundant coarse granular deposits of Tβ₄ are observed inside the lumen of tubular structures and in the apices of tubular cells of parotid gland. b) (400×) submandibular glands showing a granular reactivity for Tβ₄ in the apices of tubular cells and, occasionally, within the lumen. Abundant reactive granules are also observed dispersed in the mesenchyma. c) (400×) A very mild immunoreactivity for the peptide is present in immature minor salivary gland.