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Lab-supplies developer

Ventana Medical Systems


has acquired 22 million shares of Australian medical-technology company

Vision Systems


The acquisition represents 10.2% of Vision Systems' shares, priced at A$2.85 each. Tucson, Ariz.-based Ventana says it filed a substantial shareholder notice with Vision Systems, as required under the Australian Corporations Act.

Ventana's shares fell 31 cents, or 0.8%, to $40.74.

TheStreet Recommends

Earlier this week,


( CYTC), another bidder for Vision Systems,

trumped Ventana's

previous offer.

Vision Systems, a maker of lab machines, has also discussed its sale with Washington's


(DHR) - Get Danaher Corporation Report