Bio-potential-Building up of the material potencies at the very beginning of the birth (of the Jīva (soul) in its reincarnation in new life).
pajjattī nāma sattī sāmatthaṃ. sā ya puggaladavvovacayāuppajjati.
(NandīCū p.22)
bhavārambhe paudgalikasāmarthyanirmāṇaṃ paryāptiḥ.
(Jaisidī 3.10)