Key points are not available for this paper at this time.
IThe abbreviations used are: BME, Eagle's basal medium; P-S, penicillin-streptomycin; BME (Hepes), BME buffered with 4 4 2 -h ~-droxyethy1)-I-piperaineethanesulfonic acid; PVP-40, polyviny~ppyrrolidone (pharmaceutical grade, average molecular weight, 40,000);'' Portions of this paper (including Figs. 1 to 4s) are presented in miniprint at the end of this paper.Miniprint is easily read with the aid of a standard magnifying glass.
Vandenburgh et al. (Sun,) studied this question.