Shiva Purana
मज्जाकारणवैकल्यं शुक्रं हि प्रसवात्मकम्॥ इति द्वादशधान्नस्य परिणामः प्रकीर्तिताः॥ १३॥
An alternative cause of marrow, the semen itself becomes progeny. Thus the twelvefold metabolism of blood is explained.
english translation
majjAkAraNavaikalyaM zukraM hi prasavAtmakam॥ iti dvAdazadhAnnasya pariNAmaH prakIrtitAH॥ 13॥
hk transliteration by Sanscript