Proto-East Altaic'

Palatalization of the Proto-Altaic' velars and some successiv reorganization of the vowel system introduced a new, palatoalveolar series, separate from retroflex. Smaller changes include b → β and development of ŋ ŋʷ.

The stops were very likely allophonically voiced when prenasal, as they developed to voiced stops in daughterlangs almost universally.

	Labial	Dental / alveolar	Retroflex	Palato- alveolar	Velar		Uvular
					Plain	Labialized	Plain	Labialized
Stops	p	t	ʈ	ʧ	k	kʷ	q	qʷ
Fricativs	β	s	ʂ	ʃ
Nasals	m	n			ŋ	ŋʷ
Approximants		l		j		w

Vowels come in four tense-lax pairs:

Pair	Tense	Lax
High front	i	ɪ
High back	u	ʊ
Mid	e	ɜ
Lo	ɑ	æ

(N)CV(C)

Splits to Proto-East-A Altaic', Proto-East-B Altaic' and Proto-East-C Altaic' ca. -2ka.